aight, my cars about 11 years old now, so here I go.
If you're like me and wax often, but haven't used some really expensive stuff (I usually just bought the std. Turtle Wax) I'd highly reccomend that you use Zymol or some other good brand. It makes a HUGE difference. Granted my car has it's share of swirl marks and whatnot, but a good bit of them were either hidden or repaired as soon i as started using a higher grade wax. No it didn't make my paint flawless, but it looks hella better. Mad props for those Germans, not only for my BMW, but for the Zymol i now will be buying for my BMW.... Hope that helps.