More about engine oils..

[Larry Jenkins]

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Originally Posted by Mitch//pa

I can only comment on royal purple in a racing application. We have found that
it would break down with race fuel and become super diluted. Would I use it in my A hell no but I do use Mobil 1 ..15/50 and rotella 15/40 in A's.. I have never used a zinc additive as both products contain it in enough levels

Mitch.. Is the quantity of zinc the same in the Rotella and the Mobil 1? Do you agree the A engine needs some zinc?

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