Mercedes Benz has been hit with a class action lawsuit in California.
This lawsuit alleges that the premature wear in the M156 V8 engines leads to engine problems and in some cases failure of the engine.
The suit also alleges that both Mercedes and AMG have known about this issue since 2007. The suit states that the camshafts used are made of cast nodular iron but the valve lifters used are made of 9310 grade steel.
The combination of these metals contributes to premature wear of the M156 motors.