think you can do stuff like oil changes yourself without voiding your warranty. i know people who go for the standard "free" oil changes but also change their own oil between the free changes... there are lots of things you can do yourself... i rotate my tires myself, change my wipers, did an oil change after the first 1000km myself and change my own oil filter... that's as far as i go but it doesnt seem to be a problem... i still follow the maintenance program from my dealership, it just means i change my oil/air filter and rotate my tires more often.
Current: 2013 F10 M5 & 2013 GLK350
997.1 GT3RS (gone)
2009 WRX STI (gone)
e92 M3 (gone)