A while ago my Volvo 240 reached 13 years and 199,880 miles when the diff overheated after running through floodwater (I thought I knew Loughborough Meadows better than I actually did). I sold it for £40 on ebay, and the enthusiast who bought it managed to drive it home OK, passing 200,000 on the way.
I checked some time later, and it was still taxed and presumably running.
Chris