A Mk3? If so, injectors, injectors, injectors. If it's not had a receipt for replacement injectors and fuel pump at that mileage then walk away. Make sure you give it a good test drive and really boot it to make sure the glow plug light doesn't flash.

Also listen out for suspension noises. bot major aggro to fix, but a good haggling point. Having said that rear bushes can be expensive to replace.

There are a lot for sale, and a lot with lower mileage, so go into it with open eyes!