Mine turned 4 on March 15th and just rolled past 22,500 miles.
From this point forward, I will be taking mine to Bavarian Motors in Phoenix for service and repairs. No red carpet, free loaners, service reps in suits and pretty cashier girls, but they have BMW trained techs and have always done a great job on my BMWs for the past 10 years at a very reasonable cost. They are also very flexible when it comes to working with, installing or troubleshooting any aftermarket components which the Dealer Service Centers don't typically like to deal with.
2008 E92 M3, Alpine White & Black Extended Leather, 6MT with all options. Slightly Moded: BMW M Performance Exhaust, Rear LCI Taillight Retrofit, Angel iBrights, MGP Aluminum Caliper Covers, H&R Springs, H&R Spacers (15mm F and 12.5mm R) with +1 tires, Aluminum Pedals, Black Gloss Front and Hood Grills, Alpine White Side Grills and front reflectors, Active Autowerke Green Performance Filter.