Quote:
Originally Posted by smbrm
So "fuel shear"? A quick google doesn't yield much on the definition of this phrase?
Just curious about what you may be referring to?
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It's actually irrelevant to oil. The issue is fuel deposition on upper cylinder walls which dissolves the oil film. It doesn't matter what oil you use the gasoline will dissolve it. This issue requires tougher top rings is all.
Tracking a car might require oil with higher viscosity than spec but I doubt it. Viscosity isn't the issue. Film strength is and that is not related to viscosity.