Search  for anything...

Stanadyne Performance Formula Diesel Fuel Additive 2 Pack of 1/2 Gallon Jugs - Part # 38566

  • Based on 710 reviews
Condition: New
Checking for the best price...
$60.14 Why this price?
Save $12.27 was $72.41

Buy Now, Pay Later


As low as $10.02 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: 15 left in stock
Fulfilled by Amazon

Arrives Sunday, Feb 22
Order within 22 hours and 6 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Features

  • Made in the U.S.A. Restores/Increase Horsepower.
  • Reduces Fuel Consumptiontests show an average of 4% improvement in MPG and gains up to 9.6%
  • Cetane Improver improves combustion resulting in better engine starting, running & reduced noise
  • Reduces Wear lubricity improvers restore lubricity to ultra low sulfur diesel fuels
  • Reduces Emissions reduces Smoke and Particulates

Description

Stanadyne Diesel Fuel Additive Performance Formula The above price includes: 2 - 1/2 Gallon Jugs (64 oz.) Each Jug treats 250 Gallons of Diesel Fuel. The 2 Pack treats 500 Gallons of Diesel Fuel Virtually for every engine application big or small: ON ROAD – OFF ROAD – MARINE PRODUCT BENEFITS: Restores/Increase Horsepower – detergents clean deposits in the injection system resulting in improved combustion, better acceleration, power, and torque Reduces Fuel Consumption – independent tests show an average of 4% improvement in MPG and gains up to 9.6% Cetane Improver – improves combustion resulting in better engine starting, smooth running, and reduced engine noise Meets all engine fuel system requirements and will not harm exhaust aftertreatment systems Reduces Emissions – reduces Smoke and Particulates Cleans and Protects – detergents and deposit modifiers help protect injection pumps, injectors, nozzles, etc. Reduces Wear – lubricity improvers restore lubricity to ultra low sulfur and other low lubricity diesel fuels Stabilizes Fuel -keeps fuel fresher and protects against formations of gums caused by oxidation Cold Weather Protection – improves diesel pour point up to 40°F (22°C), and cold filter plug point by up to 25°F (13°C), depending on base fuel Corrosion Preventative – Corrosion inhibiters will protect the fuel system from rust and corrosion Helps Remove Water – special demulsifiers cause tiny water droplets to come out of suspension/emulsion, so the filter/separator can more effectively remove water Contains No Alcohol – avoids corrosion and accelerated wear Specially Formulated for use with ultra low sulfur diesel fuel Can be used with Bio Diesel Fuel up to B20 (20% bio content approved) Authorized Stanadyne Dealer: 1) Diamond Diesel & Turbocharger Service.


Brand: Stanadyne


Item Dimensions LxWxH: 6 x 3 x 9.5 inches


Item Weight: 6.5 Pounds


Capacity: 0.5 Gallons


Fuel Type: Diesel


Manufacturer: ‎STANADYNE


Brand: ‎Stanadyne


Item Weight: ‎6.5 pounds


Product Dimensions: ‎6 x 3 x 9.5 inches


Item model number: ‎2698976584


Is Discontinued By Manufacturer: ‎No


Manufacturer Part Number: ‎38566 - 2 Pack


OEM Part Number: ‎38566


Special Features: ‎Authorized Stanadyne Dealers 1) Diamond Diesel & Turbocharger Service


Wattage: ‎8.75


Date First Available: June 5, 2013


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Feb 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Best diesel additive, ever or dodge
I’ve purchased this additive for many years. Not only improves mileage, but also provides for better performance due to additives. Also, Quieten down to Cummins 5.9.
Reviewed in the United States on July 27, 2023 by David Davis

  • does what it says
It is too bad that I cannot measure the difference with and without. I do however find after 600 miles the motor home seems to run smoother, my seat of the pants review says to you buy it. I will continue to use it I just can't give you a definitive answer.
Reviewed in the United States on September 10, 2022 by Doug

  • Fast shipping, great product
Love the product, easy-to-use, lasts along time, i did my research on diesel additives years ago and this is the best. It seems a little pricey at first but it goes along way. Have recommended to friends and family. No issues with my equipment winter or summer, i add it every tank full.
Reviewed in the United States on November 14, 2022 by john k cooper

  • 5 starts is not enough!!
so I have a lb7 duramax and anyone that runs a diesel is familiar with the earlier duramax injector isssuses!!!! my 03 would smoke like a cheap date in a bar looking for a good time on a friday night but after running this I can let the truck sit and idel for 30 plus minutes and drive off without a trease of me being there. yes I did use more then recommended but that's how bad the truck would smoke!!! to give this product 5 starts is not enough!!! it is hands down worth the buy...and look if you're having injectors going out then add a little more and see what happens...you're going to spend the money if it doesn't help anyways!!! buy it buy it buy it! no regrets at all!! ... show more
Reviewed in the United States on October 11, 2021 by FRANCES YOUNG

  • Best additive
I buy the gallon jugs as you get more product for the money, I have used this on my vp44 cummins for years now with no injector or pump issues. I do see an increase in fuel economy, and I can rest easy knowing I have proper lube in my fuel system. I think I watched a video on YouTube by projectfarm that tested this against a lot of other diesel additives, and it came out on top. I don't buy the anti gel additive, and I keep number 2 in my tank even in the winter. I never gelled up, even with the -33 we saw with the 2021 polar vortex. I recommend this to my family and friends as well. ... show more
Reviewed in the United States on March 4, 2021 by Sarah

  • Work well
My husband bought this for his boat. He’s currently gone with it. I presume it works well
Reviewed in the United States on September 1, 2022 by Amazon Customer

  • Best diesel fuel additive on the market!
I was looking for an all-in-one product that cleans & maintains injectors, has anti-gelling, lubricity and smoke reduction properties, but mostly for water removal. I would have thought that all diesel fuel additives would have all these properties since they’re all essential elements but surprisingly, only Stanadyne has everything I want. I use this product in all my diesel engines: Ford F-250 with 7.3L PowerStroke, Ram 2500 with 6.7L Cummins i6, and John Deere 4052 with Yanmar i4. During my research I discovered that Stanadyne was the ONLY product verified by Ford and John Deere. Since I started using Stanadyne I haven’t once had to empty any of the fuel separators on any of my engines, a fairly common task prior to using Stanadyne. I use the LegacyPro Translucent Graduated Pitcher, 8oz for mixing in just the right amount of product. I use this product along with PRI-D Fuel Stabilizer- For Diesel 32oz for long-term bulk storage. Hope this helps. ... show more
Reviewed in the United States on May 26, 2018 by Good2Go

  • You can tell
2016 Duramax. Two plus mpg . Noticable injector improvement quite Idles smooth. Dallas to UP Michigan Tonne of equipment 70 mph Just shy of 19 mpg .
Reviewed in the United States on July 6, 2022 by Tim Meinert

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...