I know FORD doesn't want for any additive in the fuel, that isn't made by MOTORCRAFT. But I got a great deal on MARVEL DIESEL SUPPLEMENT for ULSD trucks. One bottle of 16 OZ will treat 50 gallons, but my tank only holds 38 gallons. Does anyone use or know about MARVEL DIESEL SUPPLEMENT

 

Yes its great to increase mpg,also lube upper cylinders.I use it every fill uip whole bottle and I hold 22 gals.

 

is this supplement the same as the old school marvel's mystery oil ?

 

I sometime use the diesel clean. I was given a couple of gallons for free from a family member cleaning out there garage. Not really sure if it does anything though.
It may be cleaning something? Never used any other products in the fuel.

 

I've notice it gives me a little better MPG

 

I used diesel kleen and the plastic filter in the tank disolved, had plastic pieces for weeks, went through 3 filters.