When the car gets too expensive to repair has been the formula in my family, usally when they start costing over $5000 per year
Right now I am trying to sell my 300CD mostly because I don't have resources to refurbish to car to like new condition, and it doesn't fit my needs as well anymore. I would like to see the car go to someone who has the re$ource$ and time to make the car like new again. There's just a bunch of small issues, which the parts add up very fast if I try and fix everything.
I figure it would be much easier to find a car that is already in like new condition, with only a few issues, instead of a lot of small issues...