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Mobil-1 trisynthetic all the way, probably a standard 10w-30 in the winter, and i use a 15W-50 during the hot summers and at the track where the heavier weight holds up better under high stress situations, it seems like most people at the track run mobil-1, i've used it for the last 3 years, i also use their synthetic gear oil, i'm sure there are other good oils out there, i just like Mobil-1, and so do lots of professional race teams, whatever you do, don't use penzoil, it's junk
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