I'm curious. What grade of oil was used, and is this cold climate?
--edit 11/15/2003--
I read your reply. I'm not recommending anything, but I would expect a 5 or 10W in anything synthetic, no blends, are more than satisfactory. I'm hoping friends in the neighborhood share use of their the Harrison R&D or VAG Com units,
http://www.ghg.net/dharrison/,
http://www.ross-tech.com/vag-com/, but this code should always be a fee-free reset at the dealer. I use the Harrison, and I'll clear codes for anyone within a short walk to their driveway.