That's what I meant to ask about the focus ST also how common are the cracked liners that can result in needing an engine replacement?
Googling around it's mentioned quite a lot on various Ford forums. I've heard remapping can make it more prone to it is that right
Is it the same with the S40 T5 and Mondeo 2.5T?
From what I understand Ford fixed the issue from later 2008 builds onwards. Whether that was fixed by a design change or tightened quality controls has never been officially confirmed that I know of. Could be related to sharing a new cylinder liner coating process introduced for the RS engines but again I don't think that was ever officially confirmed by Ford. Lot of opinions on the internet make it harder to sort the facts out.
I'd say that any cars prone to liner failure would have suffered from it by now so as long as you know the warning signs in the event of someone trying to shift a car already suffering from the problem you should be ok.
Typically shows up as car using coolant with no obvious signs of leaks, pressure still in the coolant system when the coolant temperature has dropped - seen as pressure releasing when you remove reservoir cap, occasional misfire on starting car after it being sat overnight and if you pull plugs out usually cylinder 2 or 3 depending how you count them (where's my hash key gone??) and also if you pull the plugs one cylinder will have moisture on end of plug and top of piston too.
Those tips are talking from first-hand experience of the issue! Didn't know a cracked liner could be rescued with a shim fix - Ford did the honours with mine giving it an engine transplant. That was on a 56 plate car with about 38K on the clock.