VII in Oils.

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Decatur AL USA
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.
 
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NJ
Almost all oils have VII's other than Redline and some grades of Amsoil. Better oils use better quality viscosity modifiers.
 
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4,574
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Merritt Island FL, USA
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

Thread starter
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4,630
Location
Decatur AL USA
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.
 
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