engine rattling noise

lawness

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Hi,
I got a 1997 c200 recently.It was all fine when I bought it. After two months, I have just noticed that when engine is on idle, there is a rattling noise somewhere in the engine. When I push the rev up, the noise become faster, then at certain point, the noise disappears. Can I still drive the car or need immediate fix? What could be the cause of this noise?

Thanks,
 

television

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A well known thing is the idler assembly on the front along with the belt tensioner
 

Ian B Walker

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or due to an engine oil change being immenant and the tappet buckets are not filling with oil untill the revs rise and pump oil into them
 
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lawness

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or due to an engine oil change being immenant and the tappet buckets are not filling with oil untill the revs rise and pump oil into them

Will it go away after a few days? :confused: I have just changed oil today, and the problem still exist. Maybe I should put a bit more oil in ( I put 5 liters).
 
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