The
problem with running a car for years now is the cost of repair once it's out of warranty. Even independent garages can be pricey now and a 3rd party warranty adds to cost and will often exclude many parts.
Ironically, modern diesels seem to be the worst for throwing big bills. Turbo issues, egr valves, dpf's, swirl flap, dmf's .... they are just far too complicated and I can't
help feeling the attempts to make them less diesel like has stolen the reliability. One big bill can quickly see your ownership costs rocket.
My 2009 Mercedes diesel threw an engine light just a few weeks ago. 5 faults via the reader. In 2 garages before it was properly fixed and £1000 lighter. The MOT then cost another £400 two days later. If it needs anything else in the next 6 months I'll set fire to the bloody thing.