Well, I've been reading some old posts, and can gather that most of you around here use synthetic oil (or that's how it sounds). My question is this: I've heard that if your car used to run on standard oil, it might be a bad idea to switch to synthetic. How valid is this? Has anyone experienced a problem in the past using/switching to synth? I don't know what my car used to run on, as I just bought it... so I'm a little tentative to try synthetic, for fear of...well, I don't even know what I'm fearing right now ;oops:. Thanks!!