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i went out to kragens to get some oil, and this being my first new car, i asked what weight to get. he told me 5-20 and not to use full sythetic until 8000 miles. i have about 2800, and after reading around the forums, i see that it's ok to switch to synthetic, so im ging to go back and exchange the oil. but im not sure which weight to use. i see that 5w30 popular, but what do you guys use/like/recomend?
-also, what about tanny fluid and rear differential fluid, when should those be changed?
Oh and i've been running synthetic since day one. And if you run your can anywhere near as hard as i do you'll still change your oil ever 3000 - 4000 miles. They say that with synth you can go as much as 6000 but i never do.
Owners Manual contains a chart in the Maintenance and service chapter, with oil weight recommendations based upon your local area temperatures. For the Bay Area, I'd use 5W-30 for good cold start oil flow and a possible marginal increase in fuel economy (that's the claim but I don't think I've ever noticed a difference). Where I live, the summer temps go over 100° F so I might be better off using 10W-40 in the summer time.
Check the other documents that came with your new vehicle. You should also have a Warranty and Maintenance booklet that has a schedule that owners should follow.