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USD 12.95

Stanadyne Performance Formula 38565 All Season Fuel Additive

PART# 38565 | SKU STAN38565
★★★★★ ★★★★★ 5.0 (6 Reviews)

Vehicle Fitment:
For All Diesel Engines, 16 Oz. Bottle (Treats 60 Gallons)
Quantity Price
1-5 $12.95
6-11 $12.30
12+ $11.65
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XDP carries the Stanadyne Performance Formula 38565 All Season Fuel Additive that is a superior, year-round diesel fuel additive engineered to handle most diesel fuel problems. This fuel additive does not contain any alcohol and helps to stabilize fuel by preventing gumming cause by oxidation. Corrosion inhibitors in this additive protect the entire fuel system from rust and while the lubricity improvers reduce wear. Gains of up to 9.6% and a average of 4% has been shown in independent testing with this additive. This additive comes with a cetane improver to enhance combustion and improves diesel pour point in cold weather.

  • Contains No Alcohol
  • Reduces Smoke & Particulates
  • Corrosion Inhibitors Will Protect The Fuel System From Rust & Corrosion
  • Independent Tests Show An Average Of 4% Improvement In MPG & Gains Up To 9.6%
  • Detergents & Deposit Modifiers Help Clean & Protect Injection Pumps, Injectors, Nozzles, Etc.
  • Meets All Engine Fuel System Requirements & Will Not Harm Exhaust Aftertreatment Systems
  • Stabilizes Fuel By Keeping Fuel Fresher & Protects Against Formations Of Gums Caused By Oxidation
  • Improves Diesel Pour Point Up To 40 degrees F (4 Degrees C), & Cold Filter Plug Point By Up To 25 Degrees F (-4 Degrees C), Depending On Base Fuel
  • Cetane Improver Enhances Combustion Resulting In Better Engine Starting, Smooth Running & Reduced Engine Noise
  • Reduces Wear By Adding Lubricity Improvers Restore Lubricity To Ultra-Low Sulfur & Other Low Lubricity Diesel Fuels
  • Helps Remove Water With Special Demulsifiers Make Water Droplet Come Out Of Suspension So The Filter/Separator Can More Effectively Remove Water
  • Restores & Increases Horsepower With Detergents Clean Deposits In The Injection System Resulting In Improved Combustion, Better Acceleration, Power & Torque

Recommended Treatment is 4 ounces Performance Formula per 15 gallons of fuel.
Add Stanadyne Additives to tank before filling with diesel fuel to ensure thorough mixing.
Size: 16 oz Pint (470 ml)
Part Number: 38565
Package Quantity: 12
Treatment (1:500): 60 gal (235 L)


  • MPN 38565
  • SKU STAN38565
  • GTIN 857123005012
  • ID 62
  • Manufacturer Name Stanadyne
  • Shipping Weight 1.00 lb.
  • Shipping Length 5 in.
  • Shipping Width 10 in.
  • Shipping Height 5 in.
  • Fuel Type Diesel
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L0R307


★★★★★ ★★★★★
5.0/5 Stars out of 6 Reviews
Verified Buyer
Great product and fast delivery.
Great value!
I haven’t looked for any differences but this brand was recommended by the people who rebuild my high pressure pump and XDP has a great price with stellar customer service!! Usually quick shipping as well, not much more one could ask for.
Only additive I use
I’m guessing this stuff works. No issues, thus far. I always buy from XDP because of their pricing. I use half of a bottle every fill up.
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Questions and Answers

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.

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