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What is the cause of the engine knocking sound in my Audi 80?

I have noticed a knocking sound coming from my Audi 80's engine when I accelerate. It seems to be getting worse and I'm worried it could be a serious issue. Can anyone shed some light on what might be causing this?

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The most common cause of engine knocking in an Audi 80 is a problem with the fuel octane level. Make sure you are using the recommended octane level for your specific model. If the knocking persists, it could be a sign of an oil pressure issue and you should have your car checked by a mechanic.

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