My father snapped the timing belt in his turbo Passat at freeway speed many years ago. I suspect, but cannot prove, that he money shifted it. He reported that the noise it made was "bang." I believe it.
The reason I say before 2008 is that around that time VW embraced programmed obsolescence with open arms. I have a 2012 Touran and around 200000 km (not miles) everything started breaking at once. Both driver and passenger side window lifts, front stabilizers and coils (separately), rear coils, gearbox control unit, rear lock, horn, file lines (twice) and now, to rub salt in the financial wound, it lost every drop of oil from the engine into a shopping centre carpark.
There’s a couple common bits this age like boot lock, door locks either sticking or failing to the point they must be replaced, rust of course, rear springs aren’t common but expected due to age. Some the engines are a bit so so like the bls, the 130/140hp ones are well regarded if you don’t mind a turbo replacement due to age, mileage and often cus remap.
I knew the 1.6tdis are poop, I don’t know enough about the newer ones otherwise