Agree with everything jmperlik said, I was able to pick up my 2018 at a discount...it is extremely rare to see one of these on the lot here in SE Michigan. Every once in a while you will see a used one, but it doesn't stay around long and is commanding a pretty high price for a used truck. My Father in Law drove mine and has been looking for one for the past year and hasn't found a new one comparable to mine for anywhere near what I paid...nor has he been able to find a used one that is reasonable.
A couple things have me thinking Ford is going to move away from this powerplant:
1. They dropped the plan to put the engine in the 2020 Expedition - even though GM is moving forward with putting their 3.0L in the Tahoe platform. I have seen some talk of late 2021 Expeditions possibly being available with the 3.0L but have not been able to confirm.
2. The 3.0L base engine was developed for LR/Jaguar for the European market and brought to the F-150 with some modifications. However, 2020 is the last year you can option the 3.0L Td6 in the LR and Jaguar...they are moving to their own oil burner in the next couple years (so if you wanted a Discovery with the 3.0L good luck finding one!).
3. Ford is very focused on promoting their ecoboost technology - there is a reason they haven't tweaked the 3.0L's numbers any higher - if they did they would start to rival the torque put out by the 3.5L, which is their most marketed power plant right now.
4. Ford is next focused on their electric vehicle and hybrid technology - the Mach-e Mustang and F-150 PowerBoost - and cancelled their plans for the 1.5L Diesel in their Transit Connect Vans due to "lack of market demand."
These factors indicate that there may be inadequate demand to keep the 3.0L production going (I wasn't able to find it on Ford's engine plant listing - though I didn't really look too hard). I am hoping that GM demand may help Ford keep the baby diesel game for a while longer....but until then, if you see a good deal I would jump on it before it is too late. I do hope I am wrong, I really like this engine - my wife liked the truck so much she bought a LR Discovery with the 3.0L just to have something that drove similarly.
Worldwide Locations (ford.com)