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There could be several things causing a knock in the top of your engine, most likely is that you are not using premium fuel.

Depends on the engine if its diesel the answer should be right, if its petrol it could as well be a whole bunch of other stuff.

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โˆ™ 2012-05-12 16:19:14
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Q: What would cause a knocking sound in the top of the engine when the car is in gear on an older Mercedes Benz?
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