BMW oil changes under warranty are free. You get one per year or every 15,000 miles.
Violating the OLM would violate the warranty. Not the whole warranty of course. While your engine mounts would be replaced regardless, if your engine decided to sludge up because you didn't bother to follow said OLM, or any other oil related problem, you're screwed.
That link brought up by one in an attempt to blame oil for owner stupidity. Way over the OLM in his turbo diesel. And used the wrong oil to boot.
Guess who didn't cover it under warranty.