Interesting to see all of the problems with the twins 535i. On BMW number 3, first 528i after two 3 series a '99 and a '06. Traded up from the '06 325i with 16" run flats, and could not stand the ride anymore, although it cornered like it was on rails. Chose the 528i because I did not want run flats tires on the next bimmer. Car runs great and has only needed one oil change thus far. Drove a 1200 miles round trip averaging 30 mpg at 80 mph. If not sure, stick with the aspirated inline 6s they are bullet prove. Ask any service center mechanic and they will tell you that the 5s are the most trouble free BMWs in the line up. Good solid car.
BMWs inline 6s have always provided sublime power and torque that no V6 can ever match.
Would LOVE to experience the Diesel on this platform. 30% improved fuel economy vs. gasoline engines is big!!!!!