having read this about the v6 merc,and i do admit im no lover of these german engines,having been around them for the last 20 years,in various sizes but mainly a lot bigger than these.and seen the problems they,ve had over the years,typically in german fashion,not admitting there is a fault but instead sticking with the questionable design,if i was in the market for one it wouldnt put me off.since the year dot MB v6,s have always had 4 mains,likewise the v8,s have 5 ,the v10,s have 6.its due to the fact the conrods use a common journal.which also happens to be offset ground.
the problem i would expect to be limited to a batch due to bad materials.