PlasticMac
Member
I agree, a good FSI is, indeed a joy.You will get oil vapours in the separator and over time they build up along with carbon deposits and gum up. Long life oil regimes just encourage it. Once it becomes blocked pressure just builds up in the engine forcing oil out to burn. I always checked the oil level and never overfilled the 1.4 (Cobalt Blue). The oil level alarm would go off which was a huge surprise since the oil change was only a month before to find low oil level. This just went on and on and as you know i bought the FSI which thankfully has been a great car. So as they every cloud has a silver lining.
I can see some volatile compounds (especially with poor oil quality), will go that way, and gum things up, as those same volatile compounds condense and combine with soot particles via the EGR and gum FSI inlet flaps!
The oil separator will always have oil in it, as the separation process involves the oil/vapour mixture flowing over a series of weird, with the vapour bubbles separating as they flow over each successive weir. Only after the final weir is the (bubble free) oil returned to the crankcase. If that oil is dirty (poor oil or lack of oil/filter changes) then both the gap between weirs, and the return path will get blocked, forcing oil into the inlet. I can understand that.
Just can't see how a couple of litres of brand new oil makes the leap to the top of the crankcase, and into the PCV system over 2000 miles.
Answers on postcard I guess..
Mac.