Well, define "wear and tear" items. And its also nice to look at the average/bell-curve.

If I had a V8 E39 or E53, I'd expect to replace and overhaul the cooling system around 70k miles. Sure, some vehicles may go beyond that but it seems like the coolant tank and hoses are more likely to fail than not at that point. That's not wear-and-tear in my book.

Same goes for the automatic transmission. I don't expect any BMW vehicle to go more than 100-120k miles without the need for a new automatic gearbox. Some folks go 160k and are still on their first one, but most folks need to go for a new one in the 100k range. Not "wear and tear", and I don't expect my X3 to be the exception.

Ditto for things like window regulators, wheel bearings, and stuff like that. Not wear and tear in my book, but I don't expect them to last forever either. We plan to keep the X3 for a long while (it's at 5 years and 132 tkm and runs great) but I expect major parts to need replacement. On the other hand, we don't intend to keep the '06 325i beyond CPO warranty.