Quote:
Originally Posted by chassis
AMG:
M156 head bolt failure and soft cam lobes
M278/M157 cylinder scuffing, valve guides and chain tensioner problems
M17x unexplained/unsolved misfires
For long term ownership I would not own any AMG V8 unless engine replacement is in your budget. Engine replacement is not guaranteed, but not unheard of.
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S85 and S63 aren't exactly Toyota engines either, though. At least S63 has improved over the years.