My wife’s 2014 Q7 TDI has 210k miles.
We love it (obviously).
Got the fix at about 140k.
Got the DPF replaced under warranty at about 180k (right before the second “fix” that prevented un-necessary DPF codes
EGR started leaking coolant in the valley around the same time so it was replaced under the warranty.
Oil cooler started leaking coolant after they fixed the EGR coolant leak and the tech compromised the glow plug harness causing a code for it.
Had to have Audi approve the oil cooler fix under warranty.
Dealer fixed the compromised glow plug connector on their dime since the tech knew it was his bad.
The coolant running down the front for so long fried the alternator so I replaced that myself (needed it done as we were leaving for Christmas vacation within 24 hours and the dealer said it would be a miracle for Audi to approve that under warranty even though it was caused by the EGR coolant leak). Expensive part and not fun to install - took me 2 hours this time, next time would be 1 hour - had to remove the sway bar to get to it but easier than the alternator on my ‘09 Jetta TDI).
Dealer was great as was Audi.
Luckily those things all happened about the same time so we had loaners for about a month. They have us a ‘19 Q7 gasser for most of the time. Newer tech (it was loaded with the traffic sign camera even). Not a fan of all the extra “smarts” in the cockpit.
Was really glad to get our TDI back!