Quote:
Originally Posted by H380
Also any 0 weight oil is made from 100% man-made synthetic base stock oil. 5 weight and higher oil is made from crude oil base and modified enough to be called "Full Synthetic". That is why 0w-20 will cost more than 5w-30 from the same brand.
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I used to be dead against 5w-30 for this reason, however when you look and the individual viscosity specs, many 5w-30 oils could just as easily be labelled as a 0w-30, but for some reason, 0w-30 never took off as a manufacturer spec BUT you look at a modern API SP Resource Conserving and ILSAC GF-6A compliant 5w-30 oil and it has a high viscosity index and it could just as easily be branded as a 0w-30. To meet these modern specs, they do actually need a nice high viscosity index and good base stocks. I think these modern oils should just be branded as 0w-30 because they are much thinner when cold than what most 5w-30 oils used to be.