Surprisingly little.
Oil pressure sender at 75,000.
First new clutch at 146,000.
Fuel pump relay (and one or two other relays) at around 150,000.
Electric window motor at 75,000.
The usual trailing arm bushes every 50,000 or so.
Probably the most reliable (and enjoyable) car I've had in thirty five years driving.
I have owned a 164 twinspark for 6 years now a I can honestly say it is the best car I have ever owned. the odd things have gone wrong with it eg- handbrake cables, battery, front lower wishbones and other smaller things not worth a mention.car has now done 116,000 miles and is on original clutch and brake discs - eat your heart out vauxhall and ford owners!