I just meant that oil from the ground is a petroleum product. The labs make the synthetic, but not sure what all they use and if any of it is part petroleum. I meant things like Slick 50 and Dura Blend and the other additives. The NASCAR guys use the thinnest viscosity they can esp in qualifying to reduce the drag that comes with thicker oils. We can do that too, but our engines have to last a bit longer and don't get changed quite as often.
Hope that clears it up for you a little.
Russ
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