I would ask for a refusal letter from dealer, if they say no, go see a lemon lawyer immediately. You have rights, but you need to exercise them or lose them, lemon lawyers don't charge you anything upfront, they work on contingency and if case goes to court is often force to be paid by dealer. If you lose you pay nothing but filing fee. I wouldn't try a lubrication strategy until you have them on recording refusing to fix it. This will likely be my last Mopar as well, in fact I will likely never buy a new vehicle, I'd be more inclined to fix older ones that were built better. 90's Fords with those Windsors have a special place in my thoughts, best engines I have owned. I'm not a HP junky or have needs for it, so the hemi is overkill for me personally.
Mine started this at 3500 miles, we at ram forum developed lubrication strategies to deal with this and had very good success rates. It is a large deal in 4 gen as you can imagine the shear number of hemi ticks on this board. Look at these polls and results, the redline poll you can see the ram forum members who killed this tick.
Now, these strategies are not supported by the dealer, if you have a failure you should tow truck home and change oil before letting them touch it, they will likely test the oil in that case. If you try these strategies please vote yeah or nay depending on success or not in those threads. Now, the science of molybdenum is that it takes time to plate, which then kills the tick, this can take 500-1700 miles. My tick was silenced at 500 mile mark, has been butter smooth for over a decade. This has an 80% success rate, not bad for an oil change. Do yourself another favor, but a royal purple filter 20-820 if you do this. I'd go redline 5w30, it is hemi honey and has had the best results on the board for any hemi, 5.7 mds or 6.4, when it comes to hemi tick.
Read these threads.. PM me if you have any questions, sorry to hear yet another one of these with so few miles and a krap dealer.
did redline kill your hemi tick poll
did lubegard kill hemi tick poll