i like 15w50 in my 3000gt, synthetic only.
it seems higher performance cars like the thicker oils (better protection), but if you are making a lot of power, you might notice a slight power increase with some good (expensive) 10w30 or 5w30 synthetic oil. also, it all depends on what kind of climate you are in, it rarely gets cold here, so i running thick oil all the time isnt a problem for me, especially since synthetic will pretty much flow good no matter what.
97 240sx se, s14 sr20. 14.0 at 99. stock boost. fully built now...
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