Something I was thinking about...
Group III oils, as far as I know, are just several processed mineral oils.
With that in mind, how do group III oils get away with wide viscosity spreads, (such as 5w-40, 5w-50, etc...) without having a huge amount of VII's?
Group III oils, as far as I know, are just several processed mineral oils.
With that in mind, how do group III oils get away with wide viscosity spreads, (such as 5w-40, 5w-50, etc...) without having a huge amount of VII's?