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

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First answer by Timbo6108. Last edit by Mercedes Sondra. Contributor trust: 23 [recommend contributor]. Question popularity: 43 [recommend question]

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