Knocking sound at 3500 revs
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 Hi guys , think i need oil change as sounding a bit tappety.Its a standard v6.Im more worrind as ive got a knocking at 3500 revs.Its not a deep knocking. more like a rattle. Any ideas guys? 
 
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 tappets. but that is mainly around idle revs. however mate got this with his golf at mo and its warped pistons 
 
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 I wondered if it could be worn pulley? its that kinda sound. 
 
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 could be a bearing in your pulley maybe??? i get this at mid rev aswell or when i keep the car at a constant speed, altho it £30 for an oil change kit and £5 for a hydro tappet cleaner kit, might be worth trying that aswell ( i done this and its much much better), next stop is theres a cover thing on the tappet/valve that can be sticking aswell apparently and you can buy them at ten a pennie aswell but they look a bugger to fit altho in not 100% sure 
 
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 My tappets wee sounding a little noisey, got an oil change and it went!! 
 
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 cheers guys, great help.Whats the sound of bad big ends just incase mechanics try to pull a fast one? lol 
 
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 exteremly loud clunking from the bottom end on the engine….. 
 
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 Hmmmmm, if it sounds more than tappets could be the Big End Rod Bearings at that RPM, 300 quid fix