I have had this problem before but dealer fixed under warranty and they were vague as to what the problem was. It is an '07 A4 2.0T about 65k it has already had a new PCV valve and the piston rings were changed at about 30k. Oil consumption has been very low(1l every 8-10k) after the rings were changed and now has increased(1l every 3-4k). Could the PCV cause this? Or how about the diverter valve. Car is no longer under warranty so dealer trip is not a viable option. Is there a way to test each? thanks

Tim

 

Check out this thread on AZ, includes discussion of DV and PCV failure: http://www.audizine.com/forum/showthread.php?t=153392

 

Why were the rings changed? You prolly have mis-seated rings now due to improper break-in.

 

at one time the car went below the magic 1K per liter of oil consumption. Audi then replaced the PCV and the rings. 30K on new rings with good oil consumption. Then it started again. Dealer gave no instructions on break in and the car is not driven hard, mostly freeway miles.

 

removed PCV and it is blown out. Installed new PCV and I'll see if the oil cap oil returns

 

Wow that is weird. I had my PCV go bad (ver E) at 25tmls. Seen the usual oil around filler cap seemed to hesitate when given gas also clutch would shudder (happened one day). Took it to the German Audi folks here and at first they did not know what it could be?! Went to a larger Audi in Wiesbaden and they knew right off what it was. Replaced under extended warranty. Part was 30 Euro's, labor 60 Euro's!

Car never burned excess oil though, and that is at autobahn speeds 85-100mph.

 

So was the issue the PCV valve? I have the same issue with oil under the filler cap.

 

I changed the PCV and drove the car 700 miles to Arizona and back. There is some oil in the cap area, but not like the spray I had before. I wonder if the diverter valve may also be leaking.

 

must have been residual oil in cap area. cleaned again during trip and it is still dry. also I took the diaphram assembly apart and found a 1/2" tear in the rubber.