I too used to change my oil religiously every 3500 miles and it was a shock to the system to go 10K miles. If you need an oil change before next January, I'm pretty sure the X3 will tell you (the X5 does). If it makes you feel better, you can change it. Some here do. I picked up my 08 X5 Dec '07 and I'm just going in for my first service tomorrow at 11,000 miles.
Good luck and welcome
