My partner has a 2011 FD with the same diesel engine, now done 201,000 miles and it hasn't been touched. Having said that, it is getting a bit smoky and slow to start from cold, so I suspect one or more glow plugs aren't working. Engines are chain-cam and shouldn't need changing as long as engine oil & filter are regularly changed. Service interval is 20,000 miles but I change oil at 10,000 and use Shell Helix Professional AG.
I have a 2015 GD, only problem I know about is the rear brake calipers can seize up.
If you have a specific car in mind, I suggest you check the MOT history on-line and see what it has had in the past in the way of fails and advisories. If I see fails due to bald tyres or inadequate brakes, that would tell me that this is a car that has not been looked after. For service history I wouldn't just rely on the service book being filled in, I'd want to see the receipts for those services and any other work done on it.