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PRI-D Diesel Fuel Treatment and Preservation 1 Quart

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Product InformationStore Part Number: PRID32oz


PRI-D is a super concentrate; one quart treats 512 gallons, is a complete fuel treatment that improves all diesel fuels enabling them to perform to maximum potential. PRI-D will stabilize biodiesel from B-5 to B-20. PRI-D’s industrial strength, enhanced thermal stability chemistry reacts with fuel upon contact, and provides multiple benefits:
Engines perform better and last longer
Increased power and fuel economy
Fuel stays fresher longer
Tanks and fuel lines remain free of slime and sludge

Improved Engine Performance – PRI-D works chemically within diesel fuel to improve the combustion process. Improved combustion means improved engine performance. You will realize increased power from your engine. At the same time, you will enjoy greater fuel economy. PRI-D is also extremely effective at reducing harmful emissions, including smoke opacity, NOx, and SOx.

Reduced Maintenance Costs – PRI-D is a highly effective preventative maintenance tool. PRI-D’s proprietary, refinery-grade chemistry is unsurpassed at preventing carbon deposits and fuel system fouling. Your engine will remain cleaner and last longer. In addition, the tank slime and sludge that diesel fuel users commonly encounter is eliminated!

Extended Storage Life – Properly treated with PRI-D, your diesel fuel will stay fresh in storage for months and even years at a time. Tests have shown where PRI-D has gone a step further, actually restoring old fuel to refinery-fresh conditions. If you are storing diesel fuel for any period of time, you can’t afford to be without PRI-D.

Super Concentrated – PRI-D is super concentrated, treating fuel at a 1:2,000 ratio. This means PRI-D is extremely cost effective to use. Get the most out of your diesel fuel for only pennies a gallon!

Safe To Use – PRI-D’s enhanced thermal stability chemistry works within the fuel instead of altering it, which means the product is completely safe to use. PRI-D contains no potentially damaging Cetane improvement additives or harsh solvent chemistries. No fuel specifications are changed, therefore PRI-D meets all major engine manufacturer fuel specifications – warranties are not voided! Use PRI-D today to get the most out of your diesel fuel and your engine.

This product has been used by industrial fuel customers for years, although not widely known in the consumer market it is the best fuel treatment available no matter the price. I have personally used both the PRI Diesel and Gasoline treatments since 1993 and have never encountered a fuel related problem in any of our equipment since that time. We feel that one of the greatest assets of PRI Fuel Treatments is the long term fuel storage and the ability to recover old stored fuels. If you have used Power Service or Lucas you will find that PRI is a far superior product and less costly per gallon to use.


  • Improved Engine Performance
  • Reduced Maintenance Costs
  • Extends Fuel Storage Life
  • Super Concentrated - treating fuel at a 1:2,000 ratio.
  • Safe To Use - With PRI no fuel specifications are changed, therefore PRI meets all major engine manufacturer fuel specifications – warranties are not voided!


*Available within the Lower 48 United States and Canada only.

Tech Specs

  • Weight: 1.6 lb
  • Shipping Weight: 3 lb
  • Manufacturer: Power Research Inc/PRI
  • Manufacturer Part #: PRID32oz
  • UPC: 793750000160
  • Made In: USA

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Reviews and Ratings

5.00 Average
5 Stars 3
4 Stars 0
3 Stars 0
2 Stars 0
1 Stars 0
Rated 5.00/5 Stars from 3 customer reviews.

Do you own the PRID32oz? Please, tell us what you think about it. It helps us provide you with better products. Please note that it may take up to 72 hours for your review to appear.

Works for me
Pros: My piece of junk 2005 550 Ford diesel,crew cab dulley, Was blowing out a lot of smoke and running ragged, I been dumping in PRI-D one once to a tank full , I ran 3 tanks of diesel, and the 550 doesn't hardly smoke either at start up or ideling for long times,, This is a very good product, I also use PRI-G in my gas guslers,, again very good product, Jon
Cons: NONE
Is this review helpful?
Written by on Dec 10, 2011. Ownership: Use regularly. Knowledge Level: Genius is my way of life — (243 of 353 customers found this review helpful
Pros: PRI both G & D I have used in all my gas & Diesel engines. With thebgovetnment (via EPA) tampering with fuel mixtures and additives the combustion engines are not designed to operate on theses POOR fuels. I would not consider not using an additive int fuels. As for Battery Stuff they are very responsive to customers and they ship an order quickly. Great job Battery Stuff
Cons: None
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Written by on Dec 27, 2014. Ownership: Use regularly. Knowledge Level: I know what an outlet is — (98 of 129 customers found this review helpful
Has worked for years
Pros: I had a diesel tractor that had not run for at least 5 years (awaiting the time, tools and energy to replace the ring gear and starter). Pri-D had been added to the fuel, and re-added a couple of times over the years. After new ring gear (and new battery - remember to maintain those, too), it started and ran as it had years before.
Cons: I can't be certain that my positive results have been from Pri-D; I have no failures to compare to.
The gasoline product, Pri-G, has worked better than any of the other gas preservatives I have tried. With diesel, I have not tried many others, so it's more difficult for me to judge this product. I *might* have had good luck with diesel without this additive, but I am not willing to sacrifice any equipment to a scientific experiment.
Is this review helpful?
Written by on Jul 05, 2016. Ownership: Use regularly. Knowledge Level: Genius is my way of life — (9 of 39 customers found this review helpful

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