Can Straight-grade motor oils contain VII's?

[bruce381]

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Bruce381, what level can the VI go to without suspecting VII being added other than the PP adjusters and dispersant items?

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never thought about it I guess >140 or so would mean VII.
or a wide Multi vis grade like a 10/40 or 5w40 or 15/50
bruce
bruce

 

[G-MAN]

Bruce, does the current J300 spec require non-Newtonian oils (i.e., oils with VI improvers) to be labeled as multi-grade? If so, that would preclude blending any straight grades with VI improvers, IMO.

 

[boxcartommie22]

g-man then what does it mean when say redline's racing oil 30w says on the bottle acts like 10w30? do you think that is a streight grade without vii? thanks

 

[boxcartommie22]

incidently, redline's data says that 30wt racing oil has 131 vii

 

[G-MAN]

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g-man then what does it mean when say redline's racing oil 30w says on the bottle acts like 10w30? do you think that is a streight grade without vii? thanks

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Yes. Same with Amsoil's ACD SAE 30. It's a straight grade that meets the cold cranking and cold pumping specs of a 10W, thus it could be labeled a 10w30.