And it was pointed out that as far as engine
oil, the "racing" version of the royal purple has no detergents, and will gum up your motor...so you need the street version. The racing version is better for anti scuffing but you should not use much, if you do, percentage wise.
Royal purple has some high marks in independant testing..and IF my car ever gets here, after break in, I will be using a mix of high and low viscosity Royal purple.
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