I also asked this question and it wasn't worth the trouble or expense to vary from the OTC Mobil 1 5w-30. I tried RP XPR and at 15$ a quart it wasn't worth it, i could rebuild a new engine every 10,000 miles for the price of those oil changes... watch for autozone to have their 5qts and filter for 30 bucks.
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Dark Aladdin
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