Please help! I have a 2010 W169 A180 Mercedes, unfortunately diesel is making its way into the sump (relatively quickly, 10mm increase on dipstick after a couple 100 miles). Therefore I have done the following: Replaced the high pressure fuel pump. Had the DPF checked on diagnostics, of which it seems to be successfully regenerating with 2g of soot currently within the DPF. It isn't the 'rings' as the engine starts on the turn of a key and I can assume compression is good. I am relatively sure the injectors are good as the car runs well too. Other than that Ive run out of ideas and I'm getting annoyed with this!!!!