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The N55 has an oil capacity of just over 7 quarts. That's quite a bit of oil for a 3L motor and that capacity greatly extends the life expectancy of the oil. Motor oils, gear oils, and transmission fluids are far more robust than they used to be even just 10 years ago. There is plenty of used oil analysis (UOA) data out there that suggests used oils with 7-10K miles taken out of N54 and N55 are still well within a useable range.
Comparing wear items between stock and modified cars isn't applicable here either because no manufacturer covers increased maintenance due to modifications. N54's tend to be hell on spark plugs due to how hot the motors run and their different ignition systems compared to the N55.
Air filter replacement are largely based on the conditions of where you live. For some, you could go 10K miles and need a replacement and others could go 50K before needing replacement. Contrary to popular belief, it takes quite a bit of dirt and debris to cause an intake restriction. Also, K&N filters are covered in oil which makes them visually appear dirtier than they really are and in the end, they're just junk anyways and are a great way to coat the MAF elements in a thin layer of oil which can cause drivability issues. Same goes for the brakes. BMW will cover the brake within the warranty period if they're outside of the wear spec.
BMW's free maintenance program is a bit of gimmick; however, the program is quite specific about what's covered and how the program works. This information readily available to someone PRIOR to purchase thus there should be no surprises. You can't walk into a BMW shop and tell them what you want replaced under the maintenance program. It doesn't work that way.
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