Just reached 5,000 miles on my 2018. Overall, I believe this truck is very underrated and that the diesel nameplate tends to scare a lot of peeps off simply by it being a D I E S E L. Wow....tragic.
However, I have the opinion this truck is a mechanical masterpiece of engineering. Even with the necessary EPA emission requirements, it runs smooth and quiet at all times and returns fantastic mileage numbers under all circumstances. I did install a throttle sprint-booster to pep up the accelerator pedal response which made a great difference to drive-ability. In standard form, I found the accelerator pedal a bit lethargic which tends to give the impression that the truck is slow. Sprint-Booster sorted that out (not associated with them, just a customer).
The second thing I did was to install Bilstein 5100 gas shocks all round which also allowed a 2.1 inch level on the front end. Now, in all honesty, anyone who has done this knows the unbelievable improvement in ride and handling. For those who are thinking about it....DO IT. The difference in stability between the crappy FX4 shocks and the Bilstein's is like night and day. I highly recommend this upgrade even if you do not do anything else to your truck. Well worth the cost. As a bonus, they eliminate the tail waggle going over train tracks....GREAT!
Lastly, I do add Optilube to every fill up just to protect the fuel pump from possibly crappy diesel. The engine is noticeably more responsive and quieter.
On the next oil change, I will be going with Amsoil Diesel 5W-30 Signature.
Other than that...I can honestly state this is one of the best vehicles I have ever owned, and I have had many of them over the years. Very pleased, and would not hesitate to replace it with exactly the same thing should anything ever happen to this one.
All in all....A+ to Ford from a very satisfied customer.