If you have a really wet rocker cover on your 300Tdi, it's probably the leak-off pipes that have failed. It's quite hard to notice sometimes as the ones on my Defender looked fine.
However, after I took them off it became apparant that they were in an awful condition. It was 5 years since i'd last replaced them and the rubber had completely perished. This was hidden though by the outer braiding. It doesn't take long to fit some new piping and clears up your rocker cover engine leak in no time!
