I have run FPPF Total Power and 8+ Cetane in every tank since I have owned the truck. Mix them together in an old stabil bottle and put in 4 oz per tank.
I used the same mixture with my '06 LLY. Haven't thought of using it in my LMM, but if I were to get another older diesel, I would in a heartbeat. I liked having the peace of mind using the 2-stroke giving the injectors a little more lubercation.