The diesel elite I've got has been off the road for 5 months or so up to now... (No mot / tax)
Was last running for about 5 mins at the end of November / start of December - must have been sat for at least 2 months before then too.
Went out to it today to move it, gave her 1 and a half goes on the glow plugs and turned the key... Like always, she fired straight up in a fraction of a second - starts faster than any other petrol Vauxhall I've owned! And shes got 189k on her
I would say that the engine is the least of my worries on that car.
I don’t think mileage is as important as people make out. Just because a car is low mileage doesn’t mean that it’s going to be fit/reliable, and likewise because a cars high mileage, doesn’t mean it’s worn out and ready for the scrap yard.