The triple synthetic formula of Mobil 1 fully synthetic lubricating oil series is "PAO+ EHC oil with hydroisomerized MSDW technology (Class III+base oil)+alkyl naphthalene+tricyclic molybdenum additive", and now it is gradually changed to "EHC oil with hydroisomerized MSDW technology (Class III+base oil) +PAO+ ester+". In fact, ultra-high viscosity PAO is the "Supersyn" on the packaging, which is a unique patent of Mobil and registered as a trademark. Mobil 1 performs very well when the car is hot, and the noise is very low whether it is idling or cruising. Generally, when the rotational speed of Mobil 1 exceeds 4500 rpm, the audio and video will start to diverge, because beyond this rotational speed, not only base oil but also additives are needed to protect the engine. Shell's factory in Arizona, USA, produces PAO, but it is only PAO4. PAO's oil and oil film are relatively thin, so its noise reduction ability is average, but it can provide excellent oil film at high temperature, with good high temperature resistance, so don't worry about its lubrication and protection ability.