As soon as the tyres of a brand new car touch the tarmac away from a dealer's forecourt it's instantly worth less than you paid for it. Thereon, you're facing an unwinnable battle against depreciation for the first few years of ownership.
But when it comes to the time to sell, you don't need to just give in and accept the lowest the market has to offer.
There are plenty of theories out there suggesting ways you can eke-out as much value from your vehicle when you're ready to part with it. The question is, are any of them true?
We asked a former car dealer what really makes a used motor more appealing, what it's worth spending money on, and which top tips are total tripe.