I seem to have an oil leak coming out from the top of one of my cylinders in my 2006 1.6TDCi.
I only noticed it today when I decided to take out the air box and clean the MAF sensor. I noticed oil in the rubber pipe going into the airbox when i disconnected it and oil contamination in the air filter itself, so i took the plastic engine cover off only to see it was practically covered in oil which had been burned into something that looks like a combination of soot and hard lumps of coal!
I didnt even know this was happening (no oil on floor, no tell tale signs around the visible areas of the engine bay etc., and engine has been running pretty much as expected)
Obviously i'll be taking this into the garage right away, but I was wondering if any of you could shed some light onto what may have happened, and what the best/worst case scenarios could be to fix. Reason I ask what may have caused this is that ever since I picked the car up after it had a service I noticed the oil was quite a bit above the max on the dipstick, so was wondering if overfilling with oil could have caused a seal to go possibly?
Or has something else happened?