VII in Oils.

[Gene K]

With current technology which grade oils generally contain little to no Viscosity Index Improvers?

Synthetic?

Synthetic Blend?

Conventional?

If you can make a 5W30 Synthetic (GIII) without VII it seems likely that most 5W20 Conventional(GII+?) or SB (GII/GIII) may not have any either.

 

[buster]

Almost all oils have VII's other than Redline and some grades of Amsoil. Better oils use better quality viscosity modifiers.

 

[chubbs1]

Almost all oils have VII. M1 EP oils appear to be close to having lower VII and 10w30 (grp. III-IV) is the grade that would generally have the least.

The best base oils such as GTL have natural VI's around 130-150.

 

[Gene K]

Thanks guys thats what I was looking for. I thought I remembered reading once that M1 10W30 had no VII. I know some other manufacturers sell dual rated SAE30 / 10W30 Synthetic (No VII).

Made me wonder about some of the 5W30 and 5W20.