I think you meant 0w30 Mobil 1 right Sorry just trying to be helpful, don't want some CEG-er walking into their local autoparts store and lookin' bad. Anyways unless you live where its HOT all the time, I'd stay away from the 15w50 Mobil 1 unless your running a S/C or turbo, seeing that they produce ALOT of heat and you would need an oil that can not only stand up to high revs, but stand up to the heat produced by the forced induction AND hi-revs IMO I'd just stick w/ the 5w30, seeing you don't really need the 0w30 there in Cali Also don't forget your synthetic oil filter too!

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