71 198 slant six oil

Johnny71dusty said

1) no one has that on shelves man . Very very uncommon . Most oils don't have it why they sell zinc additive . Also that wasn't my question. Of that 5 quarts how much zinc ? Any way to judge ?

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Oreilly sells Valvoline VR-1, it has zinc. It's also under $50 for 5 quarts if you buy it on Amazon.

They sell zinc additive for the same reason they sell all of the other additives - it makes them money. There is no required amount.