Nothing except for loads of rust!
The plastic trim at the bottom of the doors has fallen off due to rust!
Great car! Can be bought for very little now, quite a lot of extra stuff inside that you only find on a more luxury car. If you can live with the rust the engine will last forever and it responds quickly when pushed! The only problem (apart from rust) is it tends to skid out if you take bends too fast, but it is a family saloon after all!
I agree with the rust, but my main problem is caused by the engine.
Rust the only problem? You must be joking! How about the jumping out of gear? the steering wheel wanting to go every way apart from the one you required? The breakdown every 300 miles? The times it set itself on fire? These things didn't need mechanics, they needed priests!