Opti-Lube XPD Formula Diesel Fuel Additive: 5 Gallon Pail, Treats Up to 2560 Gallons of Diesel

Have seen a very slight increase in mpg, huge piece of mind in my 6.7 powerstroke, known for high pressure pump issues with the cp4 pump. In a fairly warm climate (NW Arkansas) so deep cold usually not an issue BUT 2020 proved to be colder than normal, I had zero issues with gelling, cannot say the same for my duramax buddies who don’t run opti-lube (or my kabuta tractor which gelled up bad). Good stuff, run it in every tank!

I have been using Opti-Lube products for probably 5 yearsI have had no injector issues , no fuel related issues and no gelling or freezing issues

Great product for my Duramax, bought to help with lubricity on my 2015 Duramax, i was worried about Bosch cp4 pump lubricity , found test results online , this product seems like the best i can use, 178,000 so far so good, with Bosch cp4

Appears to work as advertised but too early in our engine live cycle to really confirm. Mileage appears to be better once we started adding. If you do decide to do this be sure and think the steps through as this can be messy based upon where you have to pour it in.

Best value I’ve found so far. Use regularly in my 08 Duramax.