i have put 15,000 miles on my 08. two weeks ago, i put mobil delvac 1 esp 5w40 in my truck. have driven about 700 miles, and filled up twice. i have not noticed the truck going into regen at all since the change.fuel milage is more consistent since the change, probably due to not going into regen. previously had the dealer change the oil with motorcraft oil. city milage is looking up, as well as highway. 13-14 city 16-17 highway.

 

I have +14,000 on my truck and the last 4,000 have been on Delvac 1 ESP. My truck still regens at least once per tank and nothing significant with respect to any mileage improvements.

Bob