Renault Laguna III - 2.0dCI Sport Tourer Owner's Review - Fenlander
Mapmaker's point about the "worth nothing at 10yrs" is correct... it's not a logical argument as far as finances go.
I have relatives who bought a nice used Golf for £8k and kept uit 10ys until it was worth £1k. Servicing and repair costs were modest so it's fair to say that car cost them £7k.
Another relative has, over the same period, owned eight used cars. The first of these cost £5k and the following seven costs to change total £15k so £20k in total. The current car is worth £3k so the swapping has cost them £10k over the first example.
The only way for swapping not to cost, as with houses, is to buy at hard prices (trade) and sell at robust prices. Cars can very rarely make money like houses but you can radically minimise losses.