Not much really, even if this was an old car that I bought right after university for little money. Mostly wear items like brake pads, rusted exhaust system, battery, cracked head lamp. The only thing that I replaced that is not directly a wear item was the high beam lever that did not work. The car is very easy to work on, and most DIY's can work on this car. What finally made me sell this car was body rust, cosmetic things. The car is actually still running!
This car is unbelievable reliable, but very basic. The 75hp engine is barely enough for safe overtaking, with many passengers and load in the car, forget it. The ride is OK, but sound isolation is sparse. A pity Opel does not make quality cars like this anymore. This car cost me less than 100$ a year in service and repairs the 7 years I had this car. Believe it or not.
I had the same car (a Station Wagon) it was very good, comfortable and unstoppable: my dad gave it to me years ago with 198.000 km on it.
I used it till 300.000 no joke.
Too bad he had an accident and it was too expensive to repair.
Best car I ever had.
I had a 1983 kadett as my first car, it really was reliable vehicle, me and my friends drove it all across finland many times, and it never failed, only bad things were the rear brakes, and bodywork was not so good, had to be welded couple of times, I wish they could do such simple cars today, that kadett was...