Recently my CLS 350AMG came back from the workshop after a major work done...I had replaced the old engine to a second hand perfect condition engine (Original Mercedes Benz CLS 350 AMG)....after the old engine had the continuous & persistent engine sounds that was not supposed to be there.....They had discovered that it was a factory default where the pistons had been positioned about 5degrees off from its vertical position....This has caused the pistons to knocked on the engine wall when...
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