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W204 Serpentine belt - which size?

C250Ride

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Joined
May 4, 2018
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63
Location
Cheshire
Car
Mercedes C250 CDI
I need to change my serpentine belt on my 2010 w204. There seems to be two sizes (2000mm and 2153mm). My engine number is 651911 30 235601

Can anyone help advise which size I need?

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If you look on the belt the size may be printed on there, look after several engine stops to see the belt at different places on its run to be sure.
 

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