Of increasing interest to me and especially since the recent MoT failure of my diesel VW Passat with 140k over 11 years is how long to keep it. The car is in fair structural health, on a long run still returning 60 mpg (which hopefully will go on for several years). The obvious replaceable things have had to be dealt with, but the UV exposed plastics are now deteriorating. With questionable second-hand availability of spares, high parts replacement costs might hasten the car's demise rather than other aspects of its disrepair. Obviously garaging would help, but who does that anymore? I'd be interested in your observations.