You need to go Here.
https://www.ecodieselsettlement.com/content/dam/fcacourtsettlement/pdf/DOJ_Consent_Decree.pdf
I hope you did research before purchase?
Finding Techs skilled on the 3.0 (Overseas manufactured) is equal to Finding 10 day old steak in a lions pit.
Truck looks clean, How...
First, Stay away from Ebay on electronics or hard Parts UNLESS purchased from reliable sources that can be confirmed as authentic.
If you want to make changes starts with https://greendieselengineering.com/product/ram-1500-ds-ecodiesel-compliant-hot-tune/
Check Here Under things to know and $1400.00 You have power folding Mirrors
https://www.infotainment.com/collections/all/products/19-20-ram-truck-power-folding-mirrors-package?variant=9918383652900
Great White, if your cheap Distilled water is 0.89 PG, on 2014 You are welcome to run 90/10 DS/Urea (DEF). 2017 up has the sensor (urea) in most Ram DEF (Tank) those owners will need to run 2.5 Gallons of DEF to 1 Gallon DS, to stay above the 22% trigger message.
GearHead Hold96 will likely need that luck, Hold96 You will need to oversee the entire Teardown, I would also do unexpected visits if possible...IMO you should just take the offer and move on.
Hold96 you are probably 1 of over 10,000+ failures and climbing.
If your going to rely on the glow plugs, Remove them NOW and lube with high TEMP-ANTI-SIEZE. because when they fail its a PITB to remove and they break off, leaving you with CEL, no Active Regens and the Dash Messages will begin the count down to De-rated power and NO Start.
Many have stood their Ground and FCA capitulated, Its common and No surprise to me, The replacement if covered has the same risk.
What does the puking have in connection to the fuel filter...
Also why did you not perform complete service on a use vehicle? indications are NOT signs for...
You cannot just change out the CP4 to CP3 on the 3.0. No surprise to Me the engine is done, The 3.0 in America is just NOT robust in OEM config couple with poor designing and QC. Its original intent was 3200LB Car.
Get it back and sell.... What I advise.
Mitch, Just search it, Coolant is lethal to engine weather it enters through combustion or leaks into crankcase, HOAT/OAT coolant will mix with the calcium in ALL lubes today, Chemical reaction will occur check out link Below. (Byproduct)...