[Safety2213]

From my understanding, the 335i turbos are Mitsubishi turbos with very little boost at partial throttle. Mitsubishi has an excellent reputation for longevity. Regardless, like any mechanical part, I think changing the oil frequently 5K or 7.5K and coolant every 2 years should insure a trouble free life for a significant amount of time. I am not an engineer, however BMW has a long standing tradition of building in a HUGE amount of "room for error" and are conservative in their engineering. I was considering the 328i rather than the 335i b/c of the turbo's however really enjoyed driving the more powerful car.

Certainly, abusing any motor will cause problems. I have owned several first or second year model BMW's and have had very few major problems, the worst was a clutch part and a water pump. Anyway, enjoy your car and have fun!