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by Brett Davis

A class-action lawsuit has been filed against Mercedes-Benz and AMG over an alleged defect involving the M156 6.2-litre AMG V8 engine. The lawsuit claims the defect leads to premature engine wear, and potential engine failure. Mercedes-Benz has previously filed a report about the potential problem but has not issued a recall or stated how many vehicles could possibly be affected.

The AMG 6.2-litre engine is found in various Mercedes-Benz AMG models, including the C 63 AMG and E 63 AMG, as well as other models in various tunes. The lawsuit was filed in New Jersey, USA, by a previous owner of a Mercedes-Benz E 63 AMG who claims that the engine wore prematurely due to problems with the valvetrain.

According to the lawsuit, the engine’s camshafts, made from cast nodular iron, and the associating valve lifters, made from 9310 grade steel, are either not installed properly from the factory, or are not heat treated correctly which causes early wear. The plaintiff says that his now-sold second-hand E 63  suffered engine failure due to considerable wear on the left bank camshaft. The issue was not covered under warranty so he paid US$4594.26 to have the problem fixed.

Three months later, the right cylinder bank camshaft suffered the same problem. He then had to sell the car, which he says, put him at a loss of $25,000. All this happened in 2008, but according to reports, Mercedes-Benz has been aware of the potential engine problem since 2007, as cited in service bulletin S-B 05.20/20b.

Mercedes-Benz USA is aware of the lawsuit but isn’t allowed to talk about further details prior to the court action. Corporate communications manager at Mercedes-Benz USA, Donna Boland, said in a recent Motor Trend report,

“While we’re sensitive to the issues of every customer, the fact that one owner claims he had an issue does not mean that the vehicles themselves are ‘defective’. We’re pretty confident that will be apparent when this gets to court.”

Up to three different lawsuits have apparently been filed against Mercedes-Benz surrounding the same issue, with the main complaint being that Mercedes-Benz has been aware of such potential defects, but has not issued an official recall.

A specific court hearing date is yet to be finalised.

Perhaps you have or you know someone with a 6.2-litre AMG who has experienced such problems? Feel free to tell us about it in the comments section below.