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USD 7.95
Part #: STAN38565

Stanadyne Performance Formula Fuel Additive 38565

For All Diesel Engines, 16 Oz. Bottle (Treats 60 Gallons)
Part #: STAN38565
★★★★★ ★★★★★ 3 Reviews
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Stanadyne 38565 Performance Formula®

The premium all-season, multi-function diesel fuel additive, designed to tackle virtually any diesel fuel related problem.
Add Stanadyne Additives to tank before filling with diesel fuel to ensure thorough mixing. Tighten bottle cap securely after use and store upright. Store above 32°F (0°C). 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 Original Equipment Manufacturers (OEMs) have approved Stanadyne, most of them recommend Stanadyne Performance Formula, which should be used at every refueling year-round to ensure protection against fuel related problems and to maximize performance.

  • Fights the formation of corrosion and rust
  • Easier and Faster Starting - in all conditions
  • Stabilizes Fuel - antioxidants keep fuel fresher
  • Approved by Original Equipment Manufacturers (OEMs)
  • Specially Formulated for use with ultra low sulfur diesel fuel
  • Contains No Alcohol - avoids corrosion and accelerated wear
  • Meets all fuel system requirements regardless of make, model or year
  • Reduces Fuel Consumption - independent tests show gains up to 9.6% in MPG
  • Reduces Smoke and Particulate Emissions - and is suitable for ultra low sulfur diesel 
  • Hot Weather Protection - lubricants and cetane improver help when fuel is hot and "thin"
  • Reduces Wear - lubricity improvers restore lubricity to ultra low sulfur and other low lubricity diesel fuels
  • Cleans and Protects - detergents and deposit modifiers help protect injection pumps, injectors, nozzles, etc.
  • Increases Horsepower - with up to 5 point cetane gain to improve combustion, resulting in better acceleration, power and torque
  • Can be used with Bio Diesel Fuel up to B20 (20% bio content approved )  - increased water separation shown in bio content up to B20
  • Cold Weather Protection - reduces 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
  • Helps Remove Water - special demulsifiers cause tiny water droplets to come out of suspension/emulsion, so the filter/separator can more effectively remove water
16 oz Pint
(470 ml)
Part Number 38565
Package Quantity 12
Treatment (1:500) 60 gal
(235 L)
Recommended Treatment:  4 ounces Performance Formula per 15 gallons of fuel


  • MFG. Number 38565
  • Manufacturer Name Stanadyne
  • Shipping Weight 1.00 lb.
  • Shipping Length 5 in.
  • Shipping Width 10 in.
  • Shipping Height 5 in.
  • Fuel Type Diesel
  • UPC 857123005012
  • Prop 65 WARNING: Cancer & Reproductive Harm -


★★★★★ ★★★★★
5.0/5 Stars out of 3 Reviews
Love it
(Arizona) | August 2nd, 2020
Just what an 2003 lb7 need to keep running.
Shipping was less than 24 hours!
(Pennsylvania) | June 20th, 2018
I bought this product because if you search for the highest rated it was first. I ordered it at about 11. Next day was my day off so as i'm at home, UPS shows up and hands me my package. Like who else does that?! Besides the worlds fastest shipping, It works like another addictive, Dump in when filling, enjoy the benefits. I fill up tomorrow so i can see if i actually get any MPG benefits
Stanadyne performance fuel additive 38565
(Shreveport, La.) | March 7th, 2016
Very good product. We have been selling it for years with excellent results.

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Questions and Answers

Ask XDP a Question about this product (Allow 24-48 hours for reply)

Most Popular Questions

Will this specifically take care of gelling during very cold weather? If not, what is availble for the gelling problem?
View Staff Answer 

The Stanadyne performance formula fuel additive’s cold weather protection will reduce diesel fuel pour point up to 40°f (22°c), and cold filter plug point by up to 25°f (13°c). (Depending on base fuel)

If you looking for a winter specific formula, try running XDP’s Polar-D Winter Formula Diesel Fuel Additive.

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What happens to the Stanadyne additive if it is stored below freezing? Should I get rid of it? I left the bottle in my truck and the temperature got down to around zero. I don't want to use it if it will cause a problem.
View Staff Answer 

Stanadyne fuel additives will freeze in their concentrated form but not once they are added to the diesel fuel. The additive can be used as long as it is not frozen. If you see that the additive has frozen, bring the additive indoors to return to its normal properties before using.

XDP continues to closely monitor the COVID-19 (Coronavirus) outbreak. As an integral part of the automotive supply chain, at this point all call centers and distribution centers remain fully operational to ensure we keep vital service components flowing to vehicles used in transport of goods and emergency response. To ensure the health of our employees, families, and customers, we have made the following procedural changes:

  • UPDATE: Effective 6/1 Customer Service resumes normal business hours of M-F 8:30 – 9:00pm EST.
  • Effective 3/18 we have decided to temporarily close both of our retail stores in NJ and NV.
  • Our technical sales team remains available Mon-Fri 8:30am-9pm and Saturday 10:30am-7pm EST.
  • All employees have been encouraged to follow the CDC's recommendations at home and in the workplace.
The circumstances of this virus are fast moving, as such, we will continue to update you with any further operational adjustments as needed. As always, we value your business and appreciate your patience as we manage this situation together.