Opti-Lube XPD All-in-ONE Diesel Fuel ADDITIVE: 8oz Bottles (24 Pack Case)

I accidentally ordered the smaller size. I usually get them in the quart size. A great product I use it for my 43 foot diesel RV. It truly helps keep it running good.

Item comes highly recommended. Only time will tell

This is a good product. Worked for my 2003 duramax with 240,xxx miles. Less smoke on acceleration, smoother idle, and it used to smoke after idling for a long period of time now it doesn't. It definetly works. I used to switch back and forth with seafoam and Lucas. I can definetly tell it runs better with this. Thanks.

Waiting till I had used the for 3 tanks before writing this. Using in a 2011 LML Duramax. Wasn't until I was halfway through the 2nd tank that I noticed the benefits. I'm halfway through my 3rd tank now and still noticeable. Fuel mileage increased by 2.5mpg, truck is noticeably smoother, fells a little peppier, and cranks the moment you touch the key. And my injector balance rates are much better! I had two injectors reading around -2.0, but not anymore! Balance rates are great for a truck with over 140,000 miles! I will continue to use XPD in every tank after seeing these improvements! Was using stanadyne before and this is noticeably better!

no way to tell if it works but if it does its cheaper than replacing pumps

Got a recommendation for this product from the Powerstroke webpage. Put it in my 6.0 and noticed an immediate reduction in noise under the hood and it starts allot easier, highly recommend!

Bought this before buying a gallon jug. Save your containers and you can use them for your gallon jug when you get that. With the low sulphur diesel sold these days, you have to use something in your diesel engine to lube and protect it. It's another unfortunate maintenance item for an already expensive vehicle to maintain, but considering the cost of not using it otherwise, I'll pay the cost of an additive. Everyone says this increases lubricity the best and I believe it. I did notice a slight difference in engine noise and a consistent increase of about 1.5 MPG in my application since I have been using it. I did not expect the gains and I am not holding my breath, but will take it for as long as it lasts.

My 2008 F250 6.4 diesel loves this stuff. I get about 1.5-2mpg (13 instead of 11-11.5) better with this, while towing. That saves about $21 per tank and with each 8 ounce bottle costing a little under $8, I still save $13 a tank by using it. In the winter, I can double the normal amount of additive for an excellent gel prevention. The engine seems to run better, so I will keep using it.