Many car owners and friends pay special attention to the maintenance of their car after buying a new car. Especially when choosing engine oil for maintenance of their car, they like to choose engine oil from well-known brands. But in fact, many car owners do not know anything about car engine oil. They may choose a certain brand of engine oil after listening to the recommendations of maintenance personnel. Some car owners simply choose more expensive products. In fact, when choosing engine oil for cars with different uses and different grades, you should choose an engine oil that suits the performance of your vehicle. Car owners should carefully read the manufacturer's minimum restrictions on the grade label of engine oil in the vehicle manual. On this basis, choose the engine oil with different Different engine oil products with quality characteristics.

Currently, there are only a variety of motor oil products sold in the Beijing market, including international famous brands such as Shell, Total, Mobil, and Castro, as well as international brand products such as Great Wall and Kunlun. With so many different brands of products, the price ranges from tens to hundreds of yuan, Lexus rx270 navigation. This undoubtedly makes it more difficult for car owners to choose engine oil.

The role of engine oil

As a lubricant for the engine, engine oil not only plays a role in lubrication and anti-wear, but also has cooling, cleaning, anti-rust, anti-corrosion, anti-oxidation, etc. effect.

Misunderstandings in engine oil selection

When choosing engine oil, some car owners mistakenly believe that a certain brand of engine oil is the special engine oil for a certain brand of car and cannot be used for other brands of cars. In fact, this is wrong. . For example: Some car owners think that Total engine oil is only suitable for Fukang models. In fact, Total engine oil is commonly used in Peugeot, BMW, Daewoo and other models. In fact, when choosing engine oil, you must not only choose the brand and quality, but also learn to read the oil grade and viscosity standards marked on the oil barrel, and strictly follow the oil grade and viscosity requirements required in the vehicle instruction manual to select engine oil. . To be more precise, for the engine oil you are choosing, no matter the brand, as long as the grade and viscosity requirements meet the application requirements of your car, you can buy it and use it. In addition, the misunderstanding among car owners when using engine oil is to use additives at will. As the name suggests, additives, as a kind of solvent, play an increasing and supplementary role in the performance of engine oil. In the actual production process, engine oil is made of base oil and additives, and chemical additives are used to improve the performance of the base oil. There are hundreds of additives that can be combined with the base oil to improve the original properties of the base oil. Lexus rx270 colors. Therefore, car owners only need to use high-quality engine oil and do not need to add any other additives. If the car owner is particularly concerned about engine performance, he may choose a higher-grade, better-performing engine oil product.

Understand the engine oil grade and viscosity standards

The internationally recognized viscosity and grade of lubricating oil products is the engine oil viscosity classification method of the American Society of Automotive Engineers, or SAE, and The American Petroleum Institute's quality grading standard is API.

The American Petroleum Institute divides engine oil into different grades according to the oil quality grade. The letter "S" stands for gasoline vehicle oil in this standard, and then the different grades of engine oil are arranged in English alphabetical order. After the letter "S", such as: SE, SF, SG, SH, SJ. The letters after the letter "S", the further back in English alphabetical order, the higher the engine oil grade. For example, SH grade is better than SG grade, and SJ grade is better than SH grade.

The American Society of Automotive Engineers classifies engine oil quality according to the oil viscosity grade classification method. The first category is single-stage viscosity type, which is further divided into high-temperature environment type and high-temperature environment type. The grades of engine oil for high-temperature environments include: SAE30, SAE40, and SAE50. The number marked after SAE indicates the viscosity of the engine oil at 100 degrees Celsius. The larger the number, the greater the viscosity of the engine oil. Since the viscosity of this kind of engine oil is relatively high, it is more suitable for use under high temperatures in summer. Products with larger numbers should be selected in places with higher temperatures. The grades of engine oil for high-temperature environments include: SAE0W, SAE15W, and SAE20W. The W after SAE represents summer, and the number also represents the viscosity. The smaller the number, the smaller the viscosity. Listen to the quote for Lexus 350suv. Since this type of engine oil is used for high temperatures in summer and has low viscosity, oil with a smaller number should be used in areas with lower temperatures. The lower the viscosity of the engine oil, the greater the engine's starting speed; at the same time, the lower the pour point of the engine oil, the easier the oil is to be pumped, and it can reach the lubrication part more quickly, reducing the time the engine withstands dry friction.

The second type is a multi-level viscosity all-weather type: the engine oil labels are: SAE5W-30, SAE15W-40, SAE20W-50. The first half of the horizontal bar of this grade indicates the summer high-temperature viscosity performance that the engine oil of this grade is suitable for, and the second half of the horizontal bar indicates the suitable winter high-temperature viscosity performance. The smaller the number before W, the better the fluidity of the lubricating oil at high temperatures and the easier it is to start the car. The larger the number after W, the better the consistency of the oil in high temperature environments and the stronger the oil film produced. This kind of oil can be used in all seasons.

After understanding the grade and viscosity standards of engine oil, how to choose engine oil products? When choosing engine oil, car owners must understand the temperature environment of the vehicle, and then purchase engine oil according to the oil grade and viscosity requirements required in the vehicle manual. When purchasing, carefully check the grade and viscosity labels on the oil packaging, and choose oil that meets the minimum Engine oil required for grades and above. And carefully select the brand and quality of oil products, and try to choose products from well-known brands. Since there are many small refineries across the country, the quality of their products cannot be trusted. Therefore, car owners must not buy inferior products for immediate profit, which may even affect engine performance in the future. In Beijing, there are rarely extremely hot or cold temperatures in the four seasons, so under normal circumstances, engine oil that meets the multi-grade viscosity standard SAE10W-40 can be used in Beijing all year round.

In addition, choosing high-quality engine oil can also reduce fuel consumption. These fuel-saving oil products are certified by API for fuel reduction. However, this oil is more expensive than ordinary oil. However, the service time and mileage of this oil will be longer than ordinary oil, so it can be achieved. 8,000 kilometers or even kilometers. From this perspective, reducing the oil change interval will save money. In addition, fuel can be reduced within the same mileage, which will inevitably reduce emissions accordingly, which is very beneficial to environmental protection.

The reasons why lubricating oil becomes effective and how to identify it

1. The reasons why lubricating oil becomes effective

(1) Effect of high temperature ① The lubricating oil is in a high temperature environment for a long time. It will oxidize and appear blackened and thickened. ② The corrosion inside the lubricating oil increases, such as acidic spirit generated during engine operation. ③Increase of carbon deposits, sludge, paint film and other substances.

(2) Impurities mainly originate from dust in the air, metal abrasive particles, leakage (fuel, water, etc.), lubricating oil oxides, and substances generated by fuel combustion, etc.

(3) Additive effectiveness The performance of some lubricants decreases due to the effectiveness or use-up of the additives in them. For example, if the anti-wear agent in the lubricating oil is used up, the wear resistance will decrease.

(4) The viscosity index improver is effective. Due to the breakage of its long chain of inorganic molecules, it no longer has a viscosity-increasing effect.

(5) The base oil is effective. The base oil is the carrier of the additive. If the base oil is effective, the additive will not exert its effect. Lexus SUV 270.

2. How to judge the effectiveness of engine oil

Although there are national standards to determine whether the engine's lubricating oil can be replaced, most car owners or maintenance personnel mainly change the oil. It is judged based on the mileage/time of the car (manufacturer regulations) and the color and viscosity of the lubricating oil. In fact, all the above methods are unreasonable. If judged based on color, some brands of new lubricants will turn black, and some lubricants may turn black if too much noise separator is added. However, the lubricants at this time have no effect, which may cause misjudgment for people with insufficient experience. A simpler and more effective way is to use filter paper or electronic instruments to determine whether the lubricant is effective.

How to distinguish real and fake brand-name lubricants?

People often mention this topic. Famous brand oils are of good quality, have a wide market coverage, and are very popular among users. Some criminals, in order to make huge profits, make fake oils to fool consumers. Their method is often to recycle the old packaging and then fill it with inferior oils for sale. Those with certain strength Criminals even customize new packaging, imitate the appearance of famous brand packaging, and enter the market at a low price.

Generally, there are three types of imported oil products: one is using recycled waste oil after treatment and filling and listing; the other is using pure base oil mixed without adding any additives. In order to achieve lower costs; the third is to purchase high-grade oil filling and pass it off as inferior. They usually make the oil face color so that it is similar to real oil, making it difficult to distinguish from the appearance, and the fake face is confused with the real one.

How to distinguish between real and fake oil?

●Look at the appearance of the packaging. The appearance of the new oil packaging is clear and elegant, with no traces of oil or dust. The sealing cover is a disposable cover, and there is sealing tin foil at the gap. The tin foil has the manufacturer's special logo. In fact, it is the interior of Lexus rx270. Without these characteristics, it may be fake oil. In addition, in order to prevent counterfeiting, famous brand oils have special marks on the label sticker, the bottom of the tank, the inside of the tank lid, the handle and other inconspicuous places. If criminals customize the packaging and make it fake, they can tell the difference by just comparing the genuine and fake outer packaging. .

●Observe the appearance of the oil. Pour the engine oil in and observe. The real oil is light and translucent, has no impurities, no suspended matter, no sediment, has a light taste, and has better mobility when shaken. Fake oil may be darker in color, may have impurity deposits, may have a strong and irritating smell, may have poor fluidity when shaken, or may have a stringy appearance when touched by hand.

●Instrument inspection If it is difficult to identify fake oil using the simple method, please send the oil to the relevant testing department for identification.

Little knowledge about the meaning of engine oil index

"SAE" and "API" often appear on the manuals of branded engine oils on the market. "SAE" is used to evaluate the viscosity of engine oil, followed by "SAE" on the back. The number ranges from 5 to 50. The higher the number, the thicker the oil and vice versa. "API" is used to evaluate the quality of engine oil. "S" represents gasoline (our country uses "Q" to represent gasoline), "C" represents diesel, and the subsequent English letters represent the engine oil grade. "A" is the lowest grade. G" is the starting grade, and commonly used grades include "C", "D" and "F". For example, "APICD" means "D" grade oil for diesel engines in the "API" standard.

Viscosity is one of the most important properties of engine oil, and the relationship between viscosity index and engine operating temperature plays an important role in the lubrication effect of engine oil. Generally, the characteristics of "oil" are that it becomes thicker at high temperatures and thinner at high temperatures, which is different from the actual engine working needs. Additives can be used to improve the properties of oil. The Society of Automotive Engineers (SAE) has also set up SAEJ300 as a standard for defining engine oil viscosity systems. The SAE viscosity grade allows engine manufacturers and oil suppliers to use a unified standardized oil mark, and consumers also use it as a choice of oil. Viscosity standard. Regardless of whether the car engine system is hot or cold, as long as it is running and starting, it needs engine oil for lubrication. The engine oil should have high fluidity (low viscosity) when the engine is cold and starting at high temperatures, so that it can quickly provide the lubrication needs of all engine parts, minimize the insufficient lubrication time before the oil completes the first cycle, and also reduce engine wear. to the lowest. As the engine operating temperature rises, the viscosity of the engine oil must not become thinner and the strength of the oil film must not decrease in order to provide complete lubrication effect.

In the early days, single-grade engine oils were mostly used. The viscosity was marked as SAElow, SAE30, etc., and "w" was added to indicate the grade for each season, which meant that it was suitable for high-temperature environments. Taking SAE10w as an example, the classification method at a specific temperature Inside, it will not solidify if the ambient temperature is not lower than minus 20°C, so it is suitable for areas with particularly cold winters and cannot withstand the needs of high temperatures and slippery weather. If the ambient temperature changes greatly, single-grade engine oil must be replaced with the temperature. Due to poor ease of use, it is gradually replaced by multi-grade engine oil.

The so-called multi-grade engine oil is marked with two viscosity indexes at the same time, guide (redirected). For example: SAElow-30, multi-grade engine oil has the ability to change viscosity between SAElow and SAE30 temperatures. Currently, the engine oils used in cars are multi-grade engine oils.

Modern multi-grade engine oil uses viscosity index increasing additives to meet the viscosity requirements at high and high temperatures. It can achieve fast lubrication at high temperatures, reduce movement resistance and provide sufficient engine lubrication at high temperatures. It also has the advantages of no need The ease of changing to a different viscosity oil due to temperature changes.

About the engine oil replacement cycle

New car manuals stipulate the engine oil replacement cycle. This cycle is the longest replacement cycle of the engine oil. In actual use, it would be better if it can be replaced earlier. That won't cause any problems. The mileage of a new car's first oil change should be shorter. There are rules in the car's manual. From then on, the oil should be changed every 5,000 kilometers. If the car is used less frequently, it will take several years to run the full mile. Then Just change it according to time, you can change it every two years, but the replacement cycle should not be too long, because the engine oil will deteriorate over time.

Another thing to be careful about is that engine oil also consumes. When the engine is working, there is usually a phenomenon of burning engine oil. It is just a matter of a large amount and a small amount. It is usually relatively small, but you should still check the oil on the dipstick regularly. If the surface height is found to be insufficient, please replenish it in time. If you find that the oil consumption suddenly increases, you should take a closer look. This may be the reason for increased wear of the piston rings or valve stems. No matter what the reason is, check and eliminate it in time.

How to choose engine oil for your car?

There are two steps in selecting engine oil: one is the selection of application grade, and the other is the selection of viscosity grade.

The levels of engine oil application grades can be seen from the above table. The difference lies in the second letter. The further behind the law, the higher the grade. The main consideration in the selection of application grade is the engine model. The effective cylinder pressure and engine speed generated by different models of engine power and average piston speed are also different. The higher the effective cylinder pressure, the higher the engine speed, and the higher the requirements for the use level of engine oil. Generally speaking, new models of engines have higher requirements for oil use levels.

When selecting engine oil, you must strictly follow the grade selection of engine oil stipulated in the car's instruction manual. If the same grade of engine oil is not available, you can use a higher grade engine oil, but never use a lower grade engine oil. generation.

The main basis for selecting engine oil viscosity grade is the level of ambient temperature. Under normal circumstances, summer engine oils of various grades from No. 20 to No. 40 can be used in most areas of the country from April to September.

The selection of engine oil for summer must be careful. In the areas south of the Yangtze River and north of Nanling in my country, the highest temperature in summer can reach -10℃-0℃, and 25W grade can be used; In areas south of the Yellow River and north of the Yangtze River, the highest temperature in summer can reach -5℃~-15℃, and 20W class can be used; in areas in North China, central and western China, and north of the Yellow River, the highest temperature in summer can reach -15℃~-25℃. Lexus SUV 450. 15W or 10W grade can be used; in cold winter areas such as the southwest and southeast, the maximum temperature in summer can reach -25℃~-30℃, so 5W grade is required; for other cold areas, the maximum temperature in summer can also reach below -30℃, so 0W level is necessary.

Of course, if you find it troublesome to change the engine oil, you may as well choose multi-grade engine oil for winter and summer use. The applicable ranges of various multi-grade engine oils are as follows:

The applicable temperature range of the viscosity grade ( ℃)

5W／20－45～20

10W／30－30～30

10W／40－30～40 and above

15W／40－25～40 and above

20W／30－20～30

20W／40－20 ~Above 40

It can be seen from here that for the climate in Guangdong, since there are no cold summers, there is no need to buy expensive multi-grade large temperature difference engine oil. This is mainly for economic reasons. Studies have shown that oil with a larger durability temperature difference means a higher price. It should be noted that when selecting the viscosity grade of engine oil, the load, speed and wear of the engine must also be considered. If the engine load is large, the speed is low, or the wear is serious, an oil with a higher viscosity should be selected, otherwise an oil with a lower viscosity should be selected.

Expert advice

Economic and superstitious purchasing tips

1. Gasoline engine oil cannot be used in diesel engines. Do not use special gasoline engine oil instead of diesel engine oil to avoid accelerated wear and tear of the diesel engine. In principle, gasoline engine oil and diesel engine oil should be used separately. Only when the automobile manufacturer has instructions for substitution or indicates that it is a universal oil for gasoline and diesel engines, it can be substituted or used within the indicated grade range.

2. The viscosity of the engine oil should be as small as possible. On the premise of ensuring reliable lubrication of the engine, the viscosity of the engine oil should be as small as possible. Except for use in the southern summer, engine oil with high viscosity is only suitable for some engines with serious wear. Blindly using high-viscosity engine oil will increase the resistance when the engine is running, thereby increasing fuel consumption. If you choose engine oil with too low viscosity, the oil pressure may be too low, the lubricating oil film may not be strong enough, and the seal may not be tight. Therefore, the engine oil should be selected correctly according to the vehicle condition and season.

3. Adhere to the principle of economic applicability.

When choosing the application grade of engine oil, high-grade engine oil can be used on engines with lower requirements. Look at the Lexus 250 price. However, it is not economical to upgrade too much. Do not add lower-grade engine oil to engines with higher requirements, otherwise it will cause early wear and damage to the engine.

4. Multi-grade oil should be used as much as possible. Multi-grade oil has good viscosity and temperature properties, can be used in engines for a long time, saves fuel, is versatile in all seasons, and is easy to manage. I heard Lexus SUV 450 when using multi-grade oil. The color of the oil turns black easily, and the oil pressure is less than that of ordinary oil. These are general images and do not affect use.

5. Domestic brand-name engine oil should be given priority. Domestic engine oil is of high quality and low price (only 50%-60% of the price of imported engine oil), and large domestic refineries can produce high-grade lubricants that meet international standards, so you can choose with confidence.

6. Regarding the mixed use of engine oil. Do not mix single-grade engine oil and multi-grade engine oil; different brands of engine oil can be mixed by themselves when necessary, but do not mix them for a long time.

Spark plug knowledge and cremation plug knowledge questions and answers

1 What is the function of the cremation plug? What is its mechanism?

Answer: The spark plug pilot or an important component of the system, its function is to introduce the high-voltage electricity generated by the spark plug circle into the engine cylinder, form a spark between its electrodes, and burn the mixture.

The cremation plug is mainly composed of a shell, an insulator, a wiring screw, a wiring nut, a sealing gasket, a center electrode, and a side electrode.

2. What is the management environment of the cremation plug?

The working environment of the cremation plug is very vicious. It must withstand several violent changes from normal temperature to 2000-3000 degrees in the engine; it must be able to withstand -V high-voltage electricity; it must be able to withstand a generating force of 50 kg/cm2; it must be resistant to chemical corrosion from gasoline and gas.

Therefore, the spark plug is not only a component with a higher failure rate in the engine ignition system, but also a component that is more easily damaged.

3 Why is the ignition function of the cremation plug so important?

The ignition performance of the spark plug directly affects the performance of the car engine. If the ignition performance of the spark plug is not good, not only will it be difficult to start, but you will feel tired when driving, and the oil and gas will be incompletely burned. The fuel consumption increases and a large amount of exhaust gas is produced, which seriously pollutes the environment and seriously affects the service life of the engine. Want to know the down payment for Lexus rx270.

4How to determine the quality of the cremation plug?

For spark plugs that work normally in use, the surface of the porcelain core is clean and red or light brown, or there may be a very thin layer of brown powdery carbon deposits on the porcelain core; the electrode is complete and gray, and the surface There is no ablation phenomenon; the front end of the thread body is dry and the surface is brown or maroon.

What does the model of the cremation plug mean?

Answer: Spark plugs produced in different countries use different model representation methods. The meanings represented by each part of the spark plug models produced in my country are as follows:

The first part: English letters, learn from Lexus SUV270. Indicates the structure and type of cremation plug and its main dimensions.

The second part: Arabic numerals, indicating the calorific value of the cremation plug

The third part: English letters, indicating the characteristics of the cremation plug.

Example: K6RTC

K means thread specification M14*1.25, flat seat thread length 19MM, gram body hexagonal variable length 16MM.

6 means the heat of the cremation plug Value

R indicates that the cremation plug is resistive type

T indicates that the cremation plug insulator is protruding type

C indicates that the center electrode of the cremation plug is nickel-copper composite type. What is lead decontamination?

Answer: It is mainly caused by the use of inferior leaded gasoline. The lead in the gasoline is attached to the ignition head of the spark plug, causing a short circuit and stalling at medium and high speeds.

What happens when corona discharge occurs at the joint between insulator ceramic and iron shell?

Answer: Compared with reading the full version for newbies? Lexus suv270 guide (reprinted) Guangzhou Feige RX270 DVD Navigation | RX270 Feige Navigation. Corona discharge (also called flash soldering phenomenon) sometimes occurs at the joint between the insulator ceramic and the iron shell! It is a normal phenomenon! It can even be seen at night. This is not a spark plug leakage or air leakage, and does not affect the use of the spark plug.

When the spark plug is removed, brown dirt sometimes appears at the joint between the iron shell and the ceramic. This is due to the action of the high voltage driver, which causes oil particles floating in the air to be adsorbed on the surface of the insulator ceramic, which has no effect on the performance of the spark plug.

How to clean the spark plug and the spark plug hole in the cylinder head?

Answer: When the spark plug is halfway out, use a brush to clean the dirt circulating in the spark plug hole, then remove the spark plug, use a brush or cotton to clean the dirt on the spark plug, if necessary Use sandpaper to clean the ignition head.

How to adjust and replace spark plugs?

Answer: 1) Regular inspection! Clean and adjust.

2) Keep the spark plug insulator clean and dry during use.

3) When inspecting the engine, avoid collision with the spark plug insulator.

4) After the economic life, all spark plugs should be replaced at one time. Tire Q&A

Q: How do I know when it’s time to replace my tires?

Answer: If the tire "wear-resistant indicator mark" in the tread groove indicates that the tread groove depth is less than 1.6 mm, you are a complete novice. You should ask your Michelin tire dealer to replace your tires. The tire wear indicator is a protrusion in the tread groove. When the tread wears to 1.6 mm, it will be flush with the tread! You can't get it wrong. If you use tires with a tread groove depth less than 1.6 mm, there will be a sudden loss of traction and braking force in rainy weather, and the possibility of no traction in snowy weather.

If you can replace the tire before it wears to 1.6 mm, you should not have the above problems. In snowy areas, it is also wise to replace tires before they wear out. In deep snow, the tread surface of the tire should have the ability to compact and shake off the accumulated snow.

Q: How often should I check my tire pressure?

Answer: You should check your tire pressure, including your spare tire, at least once a month or before each long trip. When checking tire pressure, it should be done when the tires are cold - that is, you should park the car for at least three hours before checking. If necessary, the tire pressure should be increased to the pressure specified on the vehicle notice board. Since cold tires give the most accurate readings, drive to the nearest inflation point if possible and inflate them. Hot tires prevent deflation or decompression. It is normal for the tire pressure to be higher than the recommended cold inflation pressure after the tire heats up due to driving. If you lower the tire pressure on a hot tire, the tire pressure will not be enough after cooling. In addition, use a high-quality air pressure gauge to check tire pressure, and don't be too confident in your own eyes. You can't tell whether a tire is properly inflated by looking at it.

Q: What happens if my tires are under-inflated or over-inflated?

Answer: Insufficient tire inflation will cause the front of the tire to be too soft. This can create dangerous heat buildup that can cause premature tire failure. Overinflation makes tires more susceptible to impact damage. Either under-inflation or over-inflation will have a negative impact on vehicle operation and tread wear resistance.

Q: I plan to buy two new tires. Should they be installed on the front or rear wheels?

Answer: Rear wheels. When maneuvering into a tight corner on wet pavement, if your front wheel slips first, your car will continue to go in a straight line even when turning. This is equivalent to insufficient steering. You can speed up and then turn along the curve. It's okay to get the car back in the driveway.

But if the rear wheel slips first, the car may spin, which is equivalent to oversteer and will only be more difficult to control. Lexus gs460h wheels. This requires you to make quick and accurate steering corrections in the opposite direction of the curve, which is not a natural reaction. It's easier to control understeer than oversteer.

To keep records, the best option is to purchase four new tires of the same brand, specification, and model at one time when replacing tires.

Q: If I only want to buy one tire, what product should I buy and where should it be placed?

Answer: The only good reason to buy only one tire is to replace a tire that has been damaged by an accident or road hazard, otherwise all four tires in the set are good. When purchasing, you should look for the same specifications, model, brand and tread pattern design as the replacement tires. Replace all-season tires with all-season tires. Replace snow tires with snow tires. Replace H-speed tires with H-speed tires. In this way, you will enjoy a safer and more comfortable driving experience.

Q: How do I choose the right tires for myself?

Answer: First, check the tire sign or car owner's manual of your car.

Both documents list the model and size of the original and spare tires for your car, so check these documents first. We assume that your SUV has been equipped with P-type all-season tires and that you live in a snowy area. Consider replacing all-season tires with better LT mud and snow-proof tires. Perhaps, if you live in a rural area where muddy roads are a problem, consider switching to mud-resistant tires. Since there are so many models to consider, it's best to discuss them with your tire dealer.

Q: Who should fit my new tires?

Answer: First, make sure that the installer you choose has a cooperative relationship with a large tire manufacturer. Look for harvest certificates posted on the walls of specialty stores that have been earned by store employees or issued by these companies. Of course, check the cleanliness of the store from the showroom to the assembly room. In addition, it is also required that the shop be responsible for wheel damage caused during the tire installation process. If they can't guarantee this, try to suggest finding another place to live.

Q: How do I know what inflation pressure to use?

Answer: First, check the notice board on the car. Car manufacturers have determined the optimal inflation pressure for your car under typical operating conditions. The air pressure should never be lower than the maximum pressure indicated on the sign, nor higher than the maximum inflation pressure indicated on the front of the tire. We recommend using the pressures listed on the sign.

Q: Can tire rotation be helpful?

Answer: Yes, because if the tire rotation is appropriate, it can evenly wear the tires, extend the service life of the tires, and provide better operating performance throughout the life cycle of the tires. For example, if you are driving a front-wheel drive car, the front tires will bear most of the forces during load, acceleration, driving, steering, and braking. These will cause tire wear. The wear ratio of front wheels to rear wheels of front-wheel drive vehicles can reach 2:1. In order to ensure that the service life of the front and rear tires is relatively consistent, the tires should be rotated every 8,000 kilometers to 10,000 kilometers. If signs of premature wear or irregular wear are found, the frequency of tire rotation should be increased! But at the same time, a four-wheel alignment must be performed immediately. Regarding tire rotation methods, please consult your dealer.

Q: Can I use a "spare tire" (a small spare tire) when changing the tire position?

Answer: No, it doesn’t matter. A spare tire is a spare tire. To ensure correct and safe tire rotation, only use tires of the same structure and specifications. The specifications and structure of small-sized spare tires are different from those commonly used on vehicles, and their inflation pressure is much higher. However, if the spare tire in your trunk is a conventional tire of the same specification, it doesn't matter. Please consult your tire dealer for specific steps.

Q: What does the speed rating of a tire mean?

Answer: Formally speaking, a speed rating indicates the maximum speed at which a tire can carry a specified load under specified conditions. The letters A to Z represent the tire's certified speed rating from 4.8 km/h to 300 km/h. Commonly used speed levels are:

Q 160 km/h V 240 km/h

R 170 km/h W 270 km/h

S 180 km /h Y 300 km/h

T 190 km/h Z ZR The speed is higher than 240 km/h

H 210 km/h ZR If the tire specification mark appears in the instruction manual ZR. For example, P275/40ZR17 93W! Then the maximum speed level (the "W" in "93W") is 270 km/h.

In recent regulations to standardize tire marking standards, the instructions for use of all grades except the continuously variable Z speed grade include speed symbols and load factors. For example: P225/60R15 95H is the tire instruction manual, which states that the maximum load capacity of the tire is 690 kg and the maximum speed rating is 210km/h.

Q: Why are tires with speed ratings so noble?

Answer: Because tires with speed ratings must meet ultra-high performance requirements, they are always designed to provide excellent operating performance. For example, a V-speed tire uses the most advanced tread pattern design, tire shape, carcass material and structure, and uses special tread polymers and compounds.

While Q, S, or non-speed-rated tires also meet or exceed DOT requirements, they generally do not have the premium construction found in ultra-high performance speed-rated tires

Q: What if I use S What will happen if I replace H-rated tires with H-rated tires?

Answer: If you still want to maintain the speed rating of your vehicle, I don't know about Guangzhou Lexus accessories. The original tires should be replaced with tires of the same or higher grade. If you exchange S-class tires (maximum speed 180km/h) for H-class tires (maximum speed 210km/h), you should understand and notify the owner that the vehicle's operating functions have changed, and the vehicle's current maximum speed function is limited to the speed class The speed rating of the lowest tire. In this example, you have reduced the vehicle's speed capability from 210km/h to 180km/h.

Q: What is the purpose of UTQG_?

Answer: UTQG_ is the abbreviation of Unified Tire Quality Mark, which classifies tires according to their tread wear resistance, traction and heat resistance properties. Each tire manufacturer conducts its own inspections on these matters according to inspection procedures prescribed by the government. The tire manufacturer marks the tire grade on the front of the tire based on the inspection results. For example: tread wear resistance 400 traction AA temperature A

How to determine the tread wear resistance level?

Answer: The tread wear test is conducted at a location specified by the U.S. government, located near San Angelo, Texas, on a 400-mile stretch of highway. All inspection vehicles pass through the same lane at the same time to ensure the same inspection conditions. During the inspection, the tire tread depth was measured every 1,288 kilometers. Similar measurements were also made on reference tires. After the inspection is completed for kilometers, compare the tread depth of the tire and the reference tire, and then determine the tire grade based on the relative wear resistance.

Q: If my tire wear grade is 400, how long will the tire last?

Answer: The best way to understand abrasion resistance levels is to compare two different levels. For example, a tire with a wear rating of 400 may last twice as long as a tire with a wear rating of 200. But how long will your tires last?