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Problem solved. As BlackC55 suggested. It was the cap over the oil tensioner. The cap is mostly metal with rubber inside the cap. There is a small hole in the middle of the metal cap. I guess this is so that you can push something through the hole piercing the rubber and allows the cap to be...

Hi, I have a rusting nearside rear wheel arch on my 2003 CLK. I know this is a common problem. I have tried a couple af reputable local body repair companies but they didn't want to touch it. Anyone have experience of a company in the Aylesbury / High Wycombe area that could be trusted to do a...

Checked with the mercedes dealer and for the M271 they only now sell the complete oil tensioner. They showed me the parts diagram and the seal it not shown as a separate part. It's not possible just to buy the seal which seems hard to believe.

I got the parts diagram for the crankcase from mercedes today. Looks like there is something called a lateral oil bore screw plug at the front right handside of the engine. It's a bit hard to tell from the diagram if that is the culprit. Anyone experienced an oil leak from that plug?

Hi, My CLK lost about 1.5 litres of oil in 2k miles. I found the alternator was dripping wih oil. After a lot of searching I have tracked down the oil leak to a plastic plug on right hand side of the engine block, just behind the alternator and and below the power steering pump. Does any one...