Quote:
Originally Posted by chassis
The M156, M273 and M157/M278 all have their issues. I wouldn't use the word "durable" with Mercedes V8s. Timing chains, soft cams, cylinder head bolts, swirl flaps, cylinder scuffing, oil wicking into wiring harnesses, and more.
The latest M17x had misfire problems, as noted. I would add that this engine hasn't achieved sufficient time or production volume history to make a strong statement on reliability.
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In my experience my uncle's 5 MB V8's have been good but as always YMMV, but he has had more non-AMG V8's (aside from one E55). Probably right that durable isn't the best word choice, although by German standards, I would still say they are better (reliability wise) than BMW's or Audi's V8's which are more problematic. BMW tends to do a lot better with their 6-cylinder engines.