The X260 is all aluminium and an all new car in 2015. Facelifted just now for 2021my.
Some people say the older car (X250) is quieter and a touch more refined.
The ingenium diesels 2015+ 2.0 4 cylinders don't seem to be that troublesome, although, there have been a few members recently with what seems like a complete failure. The three cases I have heard of, were a loss of compression but as Jaguar don't sell the pistons or rings, you need a new engine. All cars were near 100k miles or so. If the rate of failure was high, then I'm sure we would of heard more on this forum.
Not heard of an ingenium petrol failing.
The V6 has been around much longer and whilst there have been failures, parts are more available for rebuilds and we know that the failure rate is very low.
It will also be a smoother and more powerful engine.
There's not enough evidence to say that any of the engines should be avoided for fear of a big failure. I would avoid leaving 20k mile gaps between services. True of any car.
Failed door locks are a common issue but they can be repaired with little cost or replaced fairly easily.
Some years suffer from water in the front or rear junction boxes. Easy enough to mitigate against. Check them before you buy and then apply the cheap fixes to stop the water getting in. (slam vents and washer pump wicking).
Some of the sat nav units are not getting updates anymore, mainly the smaller units.
They aren't unreliable cars really.
