does it contain antigel

The performance does have a antigel the winter formula is for extreme cold weather

Is this compatable with def (diesel exhaust fluid) engines. i'm in ca and have a 2011 duromax.

Like other popular additives on the market, the use does not have any bearing on the use of DEF as the DEF is part of the "after combustion stage" of any modern pick-up truck diesel engine. Stanadyne additive is one of the better additives with regards to helping to keep the injectors lubricated during use which also helps to keep them clean and therefore greatly aides in cooling the injectors which are the 3 components of any good diesel fuel; Fuel for combustian-Lubrication of pumps & injectors-Cooling of Injectors, therefore, longer life expectancy! The idea of increasing the cetane rating might be true for some of the additives one can buy, but that is really not the reason to buy any diesel additive! DEF is injected after the combustion process and only used to help dissolve and burn out any particulate matter being emitted in the exhaust.

How often do you use it? Is every fill up ok?

Yes I use 6oz every fill up it is great for the engine and increases power

What is the dosing ratio of additive to diesel fuel?

.26 ounces per gallon of diesel.

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Stanadyne Diesel Performance Formula 38566, 64 Ounce

Stanadyne Diesel Performance Formula 38566, 64 Ounce

Product ID: 6914051

Details

Brand
Stanadyne
Liquid Volume
64 Fluid
Package Information
Can Jug
UPC
753167924442
Vehicle Service Type
All Diesel On

⛽Treats 240 gallons diesel

⚙️Restores horsepower & torque

🛡️OEM-approved engine protection

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Description

🛢️ Power up your diesel—performance that won’t quit!

FUEL ECONOMY BOOSTER - Detergent & cetane improver enhances mileage and power output
PROVEN OEM ENDORSEMENT - Trusted by GM, Ford, Deere, Navistar, and meets Cummins L10 cleanliness standards
YEAR ROUND ENGINE SHIELD - Recommended for continuous use to prevent fuel-related issues
FLEXIBLE DOSING ADVANTAGE - Safe to blend or double-dose for tailored performance without risk
UNIVERSAL DIESEL COMPATIBILITY - Works seamlessly with all diesel engines—on-road, off-road, and marine

Stanadyne Diesel Performance Formula 38566 is a premium 64-ounce additive designed to treat up to 240 gallons of diesel fuel. Approved by major OEMs like GM, Ford, Deere, and Navistar, it improves fuel economy, horsepower, and torque while protecting engines year-round. Engineered by a leading fuel injection manufacturer, it meets rigorous Cummins L10 cleanliness standards and is compatible with all diesel engine types, ensuring reliable, all-season performance.

Specifications

ASIN	B000M5QPSY
Automotive Fit Type	Universal Fit
Best Sellers Rank	#21,543 in Automotive ( See Top 100 in Automotive ) #32 in Diesel Additives
Brand Name	Stanadyne
Compatible with Vehicle Type	All Diesel Engines: On Road - Off Road - Marine
Container Type	Can, Jug
Customer Reviews	4.8 4.8 out of 5 stars (758)
Liquid Volume	64 Fluid Ounces
Manufacturer	Stanadyne
Manufacturer Part Number	38566
Model Number	5
Part Interchange Info	38566
Size	64oz
UPC	753167924442 026508385661
Unit Count	64.0 Fluid Ounces

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$131.52

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The delivery time was excellent, and the packaging was secure.

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