Hello to the forum, for the current occasion I wanted to ask, who still has a damage to the steering drive of the V8 Biturbo? Probably all V8 biturbo of the engine series M 278/M 157 are affected. Symptoms: First rattles at cold start. Later rattles also in idle run. Remedy: With the M 157 a check valve is retrofitted in the oil channels of the cylinder head by Stuttgart (so the own workshop can not) in order to supply the chain tensioner optimally with oil. adjuster / chain tensioner to contain the rattle. Unfortunately, there are already M 157, which have already received several new chain tensioners despite the update. At less than 40,000km.