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500 Posts
I would say this is almost certainly at the root of your problems. These engines won't last if the oil is only changed at 21k intervals, and the 2015/2016 models won't let you know if the car thinks it needs an early service via any other method than the Remote App if you have an active subscription. (JLR ought to make subscriptions free for the life of any 2015/2016 DS for this reason alone.)Ours serviced to JLR schedule including the 21K oil change interval which seems crazy to someone who is used to 6K or less between oil changes.
There's enough evidence on this forum to be able to prove that 21k oil changes is bad, or in JLR's own words, potentially catastrophic, for the engine.
If you have never been made aware that this issue existed, or your car has never indicated that it needed more frequent servicing, then I would have thought that should increase your chances of getting JLR to cough up as you have done nothing wrong. Dealers hiding and pretending that the well known issues do not exist is not an excuse either, and should give you reason to get them to contribute too as they should have told you your car had horrific oil dilution estimates on SDD when it came into the workshop for it's 21k service.