So I have started to use Opti-Lubes XPD in my 2004 6.0 F250.
I have used it in the last 3 fill ups and here are my observations;
I ordered it from Opti-Lube and they ship FAST! I started with an initial shipment of 2 qts and then got the 1 gallon kit which comes with an 8 oz bottle and a hand pump for the gallon contanier. Both shipments survived my UPS drivers quaterback toss over my front gate and fence.
I am using about 1 oz of XPD per gallon of diesel.
I notice my avaerage milage is now around 17 MPG and that is a mix of stop and go as well as a 30 mile commute to work on a highway each day.
Before XPD I averaged about 15 MPG.
The 6.0 seems to be a lot quieter than before. It definetly starts easier in the mornings. I go to work about 5 AM and the temp in the garage is about 40 with an out side temp around 15 degrees.
Pick up and acceleration seem the same to me.
I will be changing out my fuel filters in the next couple of weeks so I am anxious to see what they look like since using the XPD.
All in all I am very happy with this fuel additive.