Quote:
Originally Posted by heavyD^2
S55 is a more complex engine with double the turbos and more hoses, coolers, etc so naturally it has a higher probability to be less reliable than the N55.
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I guess you could say that. I haven't seen anything disturbing about the S55 from the M3/M4 forums. The exact same S55 engine has been reliable in those cars since 2014. They have reduced the incidence of spun crank hub as well. Most of them happened to modded cars that have the DCT. Many of them had aggressive shifting software flashed on their DCTs as well as a tune. Now if you are talking about 10 years and 180k miles of wear and tear then yeah there are more hoses to replace. The N55 and S55 are both complex turbo engines and both have long term maintenance risks.