I have noticed a noticeably loud clatter sound coming from my engine this evening, this started after i topped up the oil from Ow30 to 5w30, this sound is one that i have heard before maybe from the oil pump? The sound usualy dissapears within a minute or so after driving away only this time the clatter has remained sustained and louder if below 2000 rpm? Any advice on this issue would be very helpful
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