took my x3 in for the 15,000 mile brake job and oil etc. the service guy tells me it doesnt need it. he says the sensors in the car will tell me when the car needs service. I asked, if the sensors were that accurate, and he says yeah they are. when the sensors tell you it needs service the car will let you know and bmw will let you know. Hard to believe but I guess I must trust this technology. A little different than chevy and toyota and you have to constantly monitor this stuff as you go. Well we'll find out as time goes on.