over 12 years of ownership, average yearly maintenance for my previous audi 100 is around rm4k (divided by 12 years). there is once in a time during the ownership having cooling coil replaced, gearbox overhaul, engine major overhaul. but usually those year having the major repair also the bill wouldn't exceed rm8k for that year.
glad that those alternator, aircond compressor, and starter lasts during my ownership, quite reliable for an european car with more than 20 years old...