Not all motor oils from the same company are the same. Generally, I agree that Mobil 1 is not a top tier motor
oil... But Mobil 0w-40 is one of their best oils. It has a VI index of 185. Most true
synthetic oils have a VI above 165. Generally, the higher the VI the higher quality
synthetic oil. I also like the fact that Mobil 1 0w-40 contains high amounts of Boron, which acts as a corrosion inhibitor and is considered an anti-wear additive (in addition to the
Zinc and Phos.). I think it is a top quality
oil, for my needs, in my 500 HP engine which gets used infrequently. I hate those cold starts but knowing it flows very well helps me overcome my apprehensions. Each to his own. Happy motoring.
