Quote:
Originally Posted by stein_325i
The only issues I know of were early M178 (4.0TT) AMG engines in the E63S suffered from misfire issues, and MB bought a lot of those cars back from owners. Merc V8's tend to be very durable. Their outgoing (non-AMG) M278 (4.7TT) V8 is practically bulletproof.
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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.