Checked the oil today, found this on the dipstick - in varying amounts as I checked several times. This was about the most. Similar to mustard in consistency and color. I can't imagine that this is a good thing. http://s24.photobucket.com/user/ddibiase/media/Audi/A4Goop_zps0e5327e7.jpg.html What is it?? Dan D Central NJ USA