Mercedes-Benz AMG 6.2 M156 V8 engine facing lawsuit over possible defect

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

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
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 put him at a loss of $25,000. All this happened in 2008Mercedes-Benz has been aware of the potential engine problem since 2007, as cited in service bulletin S-B 05.20/20b.Mercedes-Benz is aware of the lawsuit but isn’t allowed to talk about further details prior to the court action.