Motorhomes do most of their mileage on open road and engines are running for long periods. This type of running is lot better for engines compared to the average car's short trips where it never gets to operating temperature quite often.That was my conclusion when I looked at motorhomes last year (before buying a caravan). Granted I was looking for something with a shower and toilet, but £20k wouldn't get me anything under 15 years old with sensible mileage. I'd be reluctant to buy a car that old.