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Stanadyne Diesel Performance Formula 38566, 64 Ounce

4.8 4.8 out of 5 stars 610 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Diesel Additives by Stanadyne

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Purchase options and add-ons

Brand Stanadyne
Liquid Volume
64 Fluid Ounces
Package Information
Can, Jug

About this item

  • Made in the U.S.A. Restores/Increase Horsepower.
  • Reduces Fuel Consumption–tests 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
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Customers usually keep this item

This product has fewer returns than average compared to similar products.

Frequently bought together

$39.70 ($0.62/Fl Oz)
Get it as soon as Tuesday, Apr 2
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Sold by Empathic Solutions and ships from Amazon Fulfillment.
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$26.85
Get it as soon as Sunday, Mar 31
In Stock
Sold by B and S Supply and ships from Amazon Fulfillment.
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$24.95
Get it as soon as Sunday, Mar 31
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Sold by B and S Supply and ships from Amazon Fulfillment.
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Important information

Legal Disclaimer

Due to FAA regulations Fuel Additives can not be shipped via air freight, and may only be shipped via UPS Ground

Product Description

Stanadyne Performance Formula protects your diesel engine and restores engine performance. The detergent and cetane improver in Performance Formula will help restore fuel economy, increase horsepower and torque. Stanadyne Performance Formula 1/2 gallon (64 ounce) jug treats 240 gallons diesel fuel. Note: All Stanadyne Diesel Fuel Additives can be blended with each other and "double-dosing" is not damaging - although it may not provide twice the benefit. Where engine and vehicle OEMs have approved Stanadyne, most of them recommend Performance Formula, which should be used year-round to ensure protection against fuel related problems.

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Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Stanadyne Diesel Performance Formula 38566, 64 Ounce


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Customer reviews

4.8 out of 5 stars
4.8 out of 5
610 global ratings

Customers say

Customers like the quality, performance and lubricity of the auto oil. For example, they mention it works well in taming the engine noise, it improves overall performance and it helps with fuel efficiency. That said, they say it's the best diesel additive on the market and it lubrifies the injection.

AI-generated from the text of customer reviews

54 customers mention54 positive0 negative

Customers are satisfied with the performance of the auto oil. They mention that it works very well, improves overall performance, and operates like a new truck. Some say that the product itself seems great and has no issues or concerns. Overall, most are happy with their purchase and recommend it to others.

"This is a very good product, I use it in my diesels and gas equipment" Read more

"...used this product about 10 years now, and it has proven to be a fantastic treatment for my 20 year old diesel engine...." Read more

"...It dies appear as though the staring performance has improved." Read more

"...Haven't noticed a huge difference, but the engine does run smoother and it did increase our mileage a bit." Read more

24 customers mention24 positive0 negative

Customers are satisfied with the efficiency of the auto oil. They mention that it helps with fuel mileage, improves it, and adds pep to engine performance. Some say that the mileage increased by 10%.

"...It is a great cleaner/lubricant in the summer. I think it also helps fuel mileage. 20-22 in town and 25-26 on the road. Definitely recommend." Read more

"Improves fuel efficiency. American diesel is poorer quality compared to other countries." Read more

"...a huge difference, but the engine does run smoother and it did increase our mileage a bit." Read more

"...It makes my 6 cylinde diesel pur like a happy cat. Mighty on power. It's a puller." Read more

22 customers mention22 positive0 negative

Customers are satisfied with the quality of the diesel additive. They mention that it's the best all-around diesel treatment, it helps keep the fuel system cleaner, and it'll lubricate the injection. Some say that it helps with old diesel fuel. Overall, customers are happy with the product's quality.

"...It is a great cleaner/lubricant in the summer. I think it also helps fuel mileage. 20-22 in town and 25-26 on the road. Definitely recommend." Read more

"...It does not eliminate the soot but does a better job of removing the soot from my exhaust then anything I have tried before...." Read more

"...while I can't tell any obvious benefits, perhaps it is keeping the fuel system clean and functioning properly, which is the most important..." Read more

"Hands down the best diesel additive. I've been using it for over 20 years...." Read more

12 customers mention12 positive0 negative

Customers like the lubricity of the auto oil. They say it makes their engine idle smoother, improves efficiency, and starts faster. They also say it offers greater lube and is a good lubrant for Cp4 fuel delivery pumps.

"One tank with this stuff and I have noticed much smoother operation...." Read more

"I noticed a significant difference in the smoothness of my diesel engine idle and performance when using this additive...." Read more

"...For a 2005 GMC Duramax, it runs smooth and operates like a new truck...." Read more

"Pretty good lubricant for Cp4 fuel delivery pumps." Read more

11 customers mention11 positive0 negative

Customers appreciate the value of the auto oil. They say it's a great way to save money.

"Good price, quick ship. Econo size not available locally" Read more

"...Buying in this bulk sizing is also a great way to save money...." Read more

"...system repair issues and I believe that this product aids in avoiding expensive problems." Read more

"Fast shipping, safely packaged, great price. Quieted down the idle on our old F350 with the 7.3 powerstroke." Read more

10 customers mention10 positive0 negative

Customers are satisfied with the noise reduction capabilities of the auto oil. For example, they mention that it works well in taming the engine noise and making the engine run smoother. Some say that it quiets down the idle and reduces the chatter sound inherent to diesels. Overall, most are happy with the product's noise-reduction capabilities.

"...Put this in with a full set of tanks, injector noise gone in 1 tank. Amazing. Clearly works." Read more

"...The engine was quieter and smoother on the second dose. I have not had the chance to calculate mileage difference." Read more

"Got a 2002 F250 and I can tell the difference using it. Runs quieter and helps lubricate the injectors and clean them as well...." Read more

"...all but from what I can tell it does seem smoother and not as audible with the chatter sound inherent to diesels...." Read more

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