W210E55_Silver

People seem to forget these things produce over 500 hp naturally aspirated, how many engines do that? SERIOUSLY? They are not built to last forever, they are built for high performance. Head bolts are a well known weakness/flaw on they first of the model but they are only bolts at the end of the day.

Yuille36

Yes, and these bolts can be replaced, not exactly cheap I might add. But is saying that, there is nothing on the M156 that can't be fixed, if your willing to spend the $$$$

rusbel

Unfortunately, the early years of this 6.2 liter motor, 2007 - 2010 I believe, have had known issues with cam shafts, lifters, head bolts...top end in general was not well designed. I think it was the first engine to be designed by AMG and not actual MB; even some 2013 and 2014 have issues. I personally would avoid this motor, especially the early years.

rusbel

well known issue.. this is just one of the articles

The 6.2-liter, naturally-aspirated V-8 (codenamed M156) was the first engine wholly developed and produced by AMG and it's one of our favorites. Tuned to put out over 500 hp with an addicting sound track, it's widely regarded as an engine that can do no wrong.

Unfortunately, that's not the case with the previous owner of a 2007 Mercedes-Benz E63 AMG who is spearheading a class-action lawsuit against the automaker and the M156 engine for an alleged defect that leads to premature wear and possible engine failure. According to the suit, which is posted on Mercedes-Benz enthusiast site *********, the defect stems from the combination of the camshafts (made of cast nodular iron) and the valve lifters (made of 9310 grade steel). The suit alleges the following key points:

- that components were either improperly heat-treated or installed with improper offsets

- Mercedes was aware of the issue since 2007 following the release of service bulletin S-B 05.20/20b.

- Mercedes engaged in unfair business practices by selling a defective product

- Mercedes breach implied warranty of engine

hachiroku

just know what you're getting into. i love the engine so much i'd do it again...replace the head bolts i mean. this won't be my last M156 i'm sure of it.

exhaustgases

Right !!!!! That is why all industrial engines have those magic Alusil cylinders, as well as aircraft engines. I love it when someone learns me on my life long study and profession. I have to ask how many years of machinist experience do you have as well as industrial engine rebuilding experience? Most liners are iron not steel.
Now I will explain why Alusil is cheaper to manufacture. First off if it were to use iron liners they have to be made separate from the aluminum block that is the first expense. Next they have to be placed in the mold that the aluminum block will be cast in, this is the second expense. So there are 2 huge added costs to add a cast in place iron liner. Now with Alusil the whole aluminum casting is made from the stuff all cast at once. So yes it is a cheaper manufacturing process.