I wouldn't do 10K in a VW, but I've done it in the xB multiple times with M1 EP 5W30, confirmed good by UOA. Analysis is your friend if you're going to push oil changes for longer than recommended.
Originally Posted by OilUzer
whatever you do, don't trust ANY oil to 13000 miles in a small hard driven engine even 10K is too long imho. Forget what the OM says. I prefer to be on the safe side and use PP but dump it at 6K +/- Also use M1 EP and dump it @7.5K