Minor electrical problems invariably arise in these older VWs (noises and lights going off for no reason), but at around 150,000 miles, the engine uses no oil and runs the cleanest of any car I've ever seen. After 2,000 miles, the dipstick is still clean. A friend of mine bought a Fox whose odometer was broken at 250,000+ miles, and he drove it for five years that way until the trans eventually started making ugly noises.
I purchased my 1990 VW Fox after college. And I still own it. I have put more than 440,000 + miles on it. Just regular maintance and wear and tear parts (ie...brakes, tires, spark plugs, etc.) No major engine work or transmission work. I am now just starting to overhaul the engine due to low oil pressure. I never had any oil leaks other than once around 225,000 miles the valve cover started leaking. Replace it and was back on the road again. Although parts are getting hard to fine. I have driven this car everywhere, dirt roads, highways, up in the TX, NM, Co. mountains and forest, NM, Az, Tx desert, snow, rain and down on the beach in Tx. Runs like a champ.