my 07 750Li is at 43k miles and warranty will shortly expire at 50k. Do a lot of highway miles - typically 3k per month at the moment, and planning on keeping the car to around 200k miles, so questioning the wisdom (and expense....) of the factory extended maintenance and parts warranties which extend to 100k miles. Quoted $2,500 on maintenance (which is basically pre-paying oil changes & brakes) and a whopping $4700 for parts until 100k miles. I'm pretty anal about car upkepp so always have the best of everything, and practice preventative maintenance. Thoughts?