For those of you that have not heard by now, Mercedes-Benz is facing a class action lawsuit for alleged defects in the M156 V8 engine installed in numerous AMG Mercedes vehicles. You can read the class action complaint filed in New Jersey here.
According to the lawsuit, the class action may affect all current and former owners and lessees of 2006-2011 Mercedes-Benz C63 AMG, E63 AMG, S63 AMG, CL63 AMG, CLS63 AMG, ML63 AMG, CLK63 AMG, R63 AMG, and SL63 AMG models equipped with AMG M156 6.2 liter V8 engines.
The class action lawsuit alleges the V8 engines in several AMG vehicles have underlying problems that make them prone to premature wear, causing major engine damage and sometimes total engine failure.
Los Angeles resident Cedric Chan alleges in the Mercedes-Benz AMG class action lawsuit that after obtaining his AMG he experienced problems with loud ticking noises under the hood and a drop in oil pressure. The lawsuit suggests the ticking and drop in oil pressure was the beginning of the AMG engine’s destruction. The apparent problem according to the lawsuit is that the defective AMG engines are manufactured using soft camshaft metal that is improperly heat treated and/or improperly offset, making the camshaft prone to premature wear. It appears Mercedes-Benz was somewhat aware of the defect since at least 2007 when a service bulletin was released. Service bulletin S-B 05.20/20b involved parts relating to the camshafts, including the camshaft adjusters and authorized replacement for at least some adjusters; subsequent revisions to the service bulletins include P-B 05.20/20a and T-B 05.20/21a.
Due to the premature wear of the camshafts, the camshafts, valve lifters, camshaft adjusters, valve tappets, gaskets and bushings all have to be replaced.”The cost of replacement is thousands of dollars, which was passed on to Plaintiff, because Defendants did not issue a recall for the defect, even though they knew it to exist.’” (see the class action complaint here for more info).
For those interested, here is a little more info on the M156
(Source: http://en.wikipedia.org/wiki/Mercedes-AMG#.2263.22_M156_6.2L_V8 )
M156 L 6.2 V8 models
- 2007 S63 AMG (introduced at the 2006 Paris Motor Show)
- 2007 ML63 AMG (introduced at the 2006 North American International Auto Show)
- 2007 R63 AMG (introduced at the 2006 North American International Auto Show)
- 2007 CLK63 AMG (introduced at the 2006 Geneva Motor Show) (used as Safety Car for the 2006 and 2007 F1 World Championship)
- 2007 CLS63 AMG (introduced at the 2006 Geneva Motor Show)
- 2008 C63 AMG (Sedan and Wagon) (facelifted for the 2012 model year)
- 2007 E63 AMG (Sedan and Wagon)
- 2008 CL63 AMG
- 2009 SL63 AMG
- 2010 E63 AMG (Sedan and Wagon)