1, Shell Lubricating Oil;

2. Great Wall Lubricating Oil. API is a common symbol of oil certification specification, and it is the abbreviation of AmericanPetroleumlnstitute. Oil products that have passed APl test certification can be marked with the double-ring mark of API on the oil bottle. The classification standard of engine oil mainly depends on the low-temperature fluidity, high-temperature detergency, diffusion filterability, oxidation stability, wear resistance, corrosion and rust resistance, catalyst compatibility and environmental protection requirements of the oil.