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I have put 10w40 oil in my Aprilia and told it was the song stuff.. So got 15 50 now there is a rattling noise outa it.. What would be wrong
 
Yea you can run rsv in 10 40 oil but advised to use 15 50 oil.. But there's a slight rattle out top end.. Wud it be valves are cam chain tensioner
 
Cam chain tensioner are normally the culprit


Unless you have been hitting high revs and spun a cam lobe
 
Haha.. Well I do give her a high revs.. Its not as bad when engine gets warmed tho.. Think ill check the valve clearances and cam chain..
 

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