Virtually nothing, except for oil leaks from the gearbox.
This car would have to represent the very peak of automotive engineering, manufactured in the days when cars were built to last. Fortunately, this ensures that there will be cars of this model available for many years to come.
I agree, the R12 is one of the best cars of all time!!! I have got a 1978 model and it is really good. It also leaks oil from the gearbox!!!
True. My 1975 R12 is still my daily driver, and leaks some oil here and there, but will probably last forever. It just blows me away how easy it is to keep such an older car road worthy! I do some frequent trips to USA on it (800km same day round trip) and find all kinds of newer cars left in the ditch for one reason or other, and I can't believe this one is still going. I also own a 1990 Nissan Sentra wagon and I don't trust it as much. For those long trips I stick to the Renault.
First of all: please excuse my writings if they are not 100% correct, but I am not an English speaker (Romanian).
I don't think my comment is really about this car's reliability, bus it's tangent to the subject.
So:
Please consider that this car, Renault 12, was made until 2003-2004!! Yes, it's real!! In fact, the name wasn't Renault 12, but Dacia Berlina (or Dacia 1300) which is a licensed version of the french car that was produced in Romania for almost 30 years, since the 70's. Today are still produced commercial versions (pick-up) of the old car.
But the problem is that, after 1980, when the communist regime forced the economy and the original parts were assimilated and updated in Romania, their quality was poor and the car lost his fame of reliability.
Check out this link: http://www.dacia.ro/despre-dacia/istoric.