I can't see a 123 enjoying a 10k+ oil change interval. I'm sure with a bypass filter it is doable but I haven't heard of many if any people who change their oil more than 10k miles. I wouldn't feel guilty going 5k, maybe a little at 7.5k, but I wouldn't go any higher than that without getting the oil tested.
I'm sure a pretty new TDI could pull 10k on the oil pretty easy but much over that I'd hope it would have a bypass filter. What is the factory oil change interval on those? 7.5k or 10k?
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