Problems inherent of VW Diesels? TIMING BELTS! Ask when the timing belt was changed last, if he doesn't know change it AS SOON AS YOU GET IT, or you could end up with a 1.6L paperweight if it breaks.Aside from timing belts, there's nothing else that I can think of that would cause a catostrophic failure soon after you get the car.Super reliable engines. VW IDI diesels are known for being bulletproof if maintained. It's not uncommon to see one with 300,000-400,000 kilometers on it, and still running like a champ.