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New member, old problem. Engine knocking


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I have a diesel 2.2 2006 estate,High mileage. 
noticed a definite knocking noise from the top of the engine when idling. Idle is approximately 800rpm. When I raise the RPM to 1000RPM knocking stops. 
going through the obvious problems first. Noticed I have filled the oil too high, much too high and will rectify this  ASAP. Not experienced enough to consider if over filled oil would cause a knocking noise. First diesel car. 
Any advice gratefully received 

Edited by GioDicabria
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