Penn vs Valvoline test results..Ed Wright

[Ron Gusack]

Originally Posted by Alan Nyhus

Pull the pan when the engine is still hot/warm and you won't see that. High zinc oils (over 1,000 ppm) will precipitate additives when the oil is cold. -Al

This might be true Alan, but I don't see the same amount in the pan after switching to Brad Penn, which has no moly. If I convince myself that the VR1 has better wear numbers, I'll gladly live with some goop in the pan.

The question that I can't seem to get a decent answer to is why so many racers use multi weight oil instead of straight weight.