How about 6,208cc and 5439cc - Thanks, now that we have that cleared up - how about your opinions or knowledge about doing the head bolt repair on the M156 - can the M156 motor be as durable as the M113 motor after the head bolt repair? Or is the M156 just a weaker design, because of the increased power and complexity even after the head bolt repair. Can the M156 be a daily driver, if scheduled maintenance is completed and last 200,000 miles like the M113?

Thanks for the reply, I do plan on keeping my 2002, great car, really enjoy the purity and simplicity of the car. I am in the process of having my seat air bladders refurbished. Other than that the car is beautiful and running great. I enjoy having the two cars to drive on a daily basis, they are very different but, still very similar.

Thanks for the reply, I agree completely that maintainence and probably, shorter interval oil changes makes all the difference in the long term reliability of these motors. I also imagine how hard the M156 was driven comes into play on the cams, lifters and headbolts, but, I recognize, on an engine like this, how hard it’s driven really shouldn’t come into play. (I never worry about driving my M113 hard). When I drive my M156 I can still sense the similarity to my M113, I just have always associated robustness with AMG V8 motors, it’s a big part of their heritage, I still have no idea the prevelance of the head bolt issues, you certainly hear a handful of terrible instances, but really what the actual percentages are is anyone’s guess. My goal is to be able to drive and relie on this car the same as my M113, that is why I am leaning on getting the head bolts and lifters addressed, do my maintenance and be done with it, at that point my hope is 150k plus of worry free spirited driving. I assume, you have not had your head bolts changed because you are in the safe number range on your 2011.