Nothing really. Only intermittant fault on the diff lock warning light - it comes on sometimes for no reason!!!!
Excellent off-road. However, compromised for use as a car. Not very quick due to engine seeming to loose power over about 3500rpm! Best driven between 1500-3000rpm! Excellent for towing however, you don't notice that anything is on the back!
The suspension is very compromised for on road use. It sends all the bumps into the cabin yet still rolls well round corners. I can never get near the claimed 33mpg, nearer 28 is the norm and it is not driven hard. Also, the turning circle is terrible meaning that parking and turning round can be difficult. Never mind though, I just drive over most obstacles!!
Don't buy one if an estate car can fulfil your needs.
I have been very impressed with my Disco TD '96. Now 128000 KS on the clock I have covered 100000 k's and it still drives tight, no rattles or annoying squeaks. The secret to a great running and economical 300TDI is:- replace cam belt when due, adjust tappets every 30000-40000 kms (replace all cottles at 100000k's) and use a injector cleaner. You will be amazed what this does to economy and response. In NZ, diesel quality has been poor with high sulphur levels, choose a brand that guarantees low sulphur levels, these engines will runn poor on poor diesel.
Towing and 'off road' it cannot be beaten. High way driving with cruise control is great.