24 months to first oil change
 

I found a good deal on a leased 2006 X3 CPO, but the carfax shows that the first oil service wasn't done until 15K miles, but 24 months after the in service date. Is that bad?

I wouldn't rely too much on Carfax.

The original owner should have requested a "low mileage 1-year oil change".

That could have been done, but the dealer didn't enter it into the car's service record.

Or maybe the owner just decided to DIY or pay a quick change place to do it.

No way to be sure, and if any damage was done, you may not know until many years from now.

More than likely, the person didn't bother/remember to change the oil until the thing said to do so. Most folks don't know about the low-mileage annual oilchange unless they read the Service Booklet (yeah, right) or are well-informed about BMWs in general.

My thoughts exactly. But you never know what wasn't logged at a dealer.