That does not sound good...... i dont doubt that it is anything other than Early service, engine oil dilution, but trying to get anything from anybody at the other end to even accept the termilogy Oil Dilution just isn't happening ! I understand fully the other side of your dilema as mine too has been back 3 times for an Oil & Filter change ! That is all they do by the way ! there is no investigation into what causes the early on set and mine has been diagnosed over the telephone as faulty warning light by the case manager asigned to me by JLR Customer Services.... What an absolute joke they are !
JLR have and still refuse to accept that Oil Dilution is an issue, Back to your problem though, were you still in service interval ? This is the important bit, as there was a Memo produced by JLR stating quite clearly that any failure outside of the servce indicator is NOT covered by warranty, Hence the reason mines been sat on the drive since 24th Nov !
I've also asked about my Tow bar ? they said it wasn't important but then said 5 have failed catastrophically whilst towing ?
Which seemed quite important to me but hey, when theyre blaming you for everything else you'd might as well take a hit on a runaway caravan as well...
All i can do at this point is give you some feedback on how mine is behaving, the last time i managed 1,700 miles between services, less than 2 months, 95% of the journeys made were Mtwy of 100 miles plus and all averaged 53 - 67 MPH. The car becomes lethargic, gear changes become laboured and some times higher revving dropping to increase revs on a hill or flicking between 8th, 7th, 6th, this is then followed ahortly after by a shaking sensation to the car, ONLY WHEN STOPPED, side to side and an engine note that sounds like its missing a few cylinders... quite violently, you woulndn't want to be in too long as it would make you feel sick, theres a fairly noxious smell that comes into the cabin and smoke can be seen coming out of the wheel arches, under the car etc, if i hit the stop start button it re sets it and we can carry on. As soon as i park it after the shaking it throws up the SERVICE NOW message.
So, i'm looking at getting booked in 28th January, as they are busy, so 2 months without car, it's just sat there. They said dont drive it...... so i'm not.
I feel that if i drive mine over the threshold it will do what yours has done, sounds like your DPF has gone, probaly clogging up as mine is doing, youve opened it up to overtake and its sooted up or its been restricted to begin with, So either the DPF or the Turbo ?
Good luck with the rejection process, i've a feeling yours will be sorted before mine as it has to wait a month before it goes in. meanwhile i'm without a car !