If you are interested, I’ve got a handful of slightly used parts you might can use. A swb/grey grill, a set of aftermarket headlights, and some fogs I think. Will have to confirm the fogs. PM if you are interested. I can shoot you some photos.
AMS OIL 75W90 severe gear without the lsd additive is what I’ve used the last two fluid changes. Zero issues. Did the drop and fill a few months ago and the fluid looked great. Just a little north of 40K between services.
hopefully they were just bored with nothing else to do. I'd let it ride until they gave you grief again. If they do, bagged suspension would be a good solution. Maybe just the rear?