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Unfortunately BMW has pushed the whole thing about bringing your car in when it's say to bring it in. The maintenance ones I go by are fairly simple and straight forward.
1. Oil and oil filter change every 7500-10K
2. Tire rotation during each oil change
3. Spark plugs every 36K (this one is a bit tricky, with my 5 series they lasted at least 40-50K miles, but with M cars I've heard that 36K is the mark to track)
4. Engine air filter every oil change or every other (10K - 20K)
5. Transmission oil change every 40K-60K - you should be able to find the exact interval from ZF (do not believe any BS about it's a lifetime fluid)
6. I can't remember the source but I remember reading somewhere that fuel injectors are good for 60K or so. In my own experience I'll be airing on the side of caution with this one, my old 5 series had a failed injector that lead to a bad catalytic converter. I lucked out with the catalytic converter being replaced under warranty but it was still a hassle as my local dealership had a hard time isolating the issue.
7. Routinely check the overall components as BMW love their plastics.
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