I have a mk4 golf smokes. I've owned it for 3 years and known the car for another 2. In my 3 years of ownership I've been stranded twice. The 1st time the DMF jumped 1/4 of a turn and foolishly I carried on driving. 80 miles later the diff made a break for freedom through the gearbox lol. That was in Early 2008.
The 2nd time was last month when a inner CV joint popped.
I worked for a VW specialist for 2 years in the past so I've looked after the car myself doing my oil change pretty much as soon as the dash says so always with genuine parts. All in all the car has been good as gold over the 75k of miles I've done in it including driving to Alicante and back earlier this year on holiday without a hint of a problem

also survived the Valencia maniacs in the city centre.
MOT just happened and once again emissions were 1 of the lowest the tester had seen on a car this age