There may be some truth to this. Some people here do their own oil changes and stuff on intervals they deem reasonable. Others do what the dealer tells them. I do what the car tells me. Check control is pretty advanced in this car, and it modifies service intervals based on how you drive the car.
2008 E92 M3 6MT, AW/Blk Ext., brushed aluminum
2006 E46 M3 ZCP 6MT Carbon blk/blk(sold)
2001 E46 325Xi 5MT Jet Blk/Blk (sold)