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I think me and Vancouver will agree on this: you really aren't getting crap if you've or someone else has been using regular oil for a number of years and you suddenly decided to use synthetic. Your engine components are already coated in mineral oil and they will stay so. Unless you take it apart, have someone do port and polish and whatever and whatnot, and then you start using synthetic, you're wasting your money. Not sure if anything can go wrong.
I would also really like to know what is the best oil grade for my car. Nissan dealer uses 5-W-30, I'm not sure I liked that too much. I was gonna bring them 10-W-40 next time I change my oil, but now I'm not so sure about it. So what is the best oil?
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