Quote:
Originally Posted by edpontiac91
I think that we are talking about the two different blends. Royal Purple that you buy in PEP BOYS is about $7.00 a Quart. There Racing Oil is called XPR, and costs about double that. That's the stuff that you have to change after every race season. The automotive grade is very close to the Mobil 1 in every aspect, including oil changes and the additives that are put into it.
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Additives are the deal here. Like you have mentioned, race oil is not made to have the same longevity as street oil.