In reply to Tom Ripley Mountain Guide:
Until last October, when I bit the bullet yet again, I've had 3 cars in 26 years.
I put 240,000 on the first one in 12 years (13 years old when I got rid...company liquidation sale at 1 year old). Petrol.
Got the second one at 3 years and took it up to 230,000 8 years later, when it was terminated by an accident. Petrol.
Third one I got at 5 years old and took from 80,000 to 255,000 in 6 years. Diesel.
All of them still had mechanically sound engines after that mileage. Got rid of the 1st and 3rd when MOTs indicated several £ hundred needed on stuff like hydraulics, bodywork, etc to get through their MOTs
It's a fine judgement call on when to stop paying out for cars of that age, but in both scrappage cases I'd put a "pre-set limit" on what I was prepared to pay to keep them going and get them through MOTs, and was ruthless in sticking to it. But it was a big bonus knowing the history of my cars as they got older, and understanding when things were becoming a poor risk (ie, if I put a new clutch in now, it'll soon be over the limit for a new timing belt, so do I risk it? Or do I want to pay out for a new timing belt in 3 months time?....etc).
I do tend to have a little grin when people tell me their 60,000 mile cars "need" changing because of the "high mileage"!