i bet there is no tdi mondeos in 20 years time, at least if a cossie develops a missfire it can be fixed cheaply by the roadside, a sierra is very basic and easy to keep reliable with a bit of maintainance, i can see a lot of these common rail electronic controlled everything cars ending up in the scrapyard at a very young age as it is soo specialized and expensive to fix even the smallest of problems now. my advice if buying anything like this would be to buy quite new with warranty.