Quote:
Originally Posted by bbnks2
N55 issues are in-large the same as N54. Oil gasket leaks (oil pan, thermostat housing, oil filter housing), coolant tank explodes, water pump failure on pre- 12/2012 build dates, HPFP is shared between both except N55 gets newer revisions depending on build date... Main benefit of N55 over N54 is no injector issues and the motor itself has superior oiling and cooling.
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^This. The N55 with an upgraded hybrid is really where most want to be. Having boost fall off at 5,000 is not fun once you start pushing the car. During the 3 years I have owned the 335i I had the oil filter housing, oil pan gasket, and coolant expansion tank replaced. I chose to do coils, plugs, and waterpump before issues showed up. I would consider this to be pretty reliable comparing it to N54 stories I have heard.