I have noticed that my Audi A6's engine makes a loud knocking sound when I start it up in the morning. It goes away after a few minutes, but I'm worried that it could be a sign of a bigger issue with my car. Is this common in Audi A6's or should I have it checked out by a mechanic?
ReplyThis is a common issue in Audi A6's and is usually caused by air trapped in the hydraulic valve lifters. It is recommended to let the engine warm up for a few minutes before driving to allow the lifters to fully pressurize and reduce the knocking sound.
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