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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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

🏆OEM approved by GM, Ford & more

⚙️Meets Cummins L10 cleanliness standard

RM422

Duties & taxes included

In stock

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Description

⛽ Power up your diesel—because your engine deserves the best!

ALL SEASON PROTECTION - Year-round formula that tackles fuel-related issues in any climate.
HIGH EFFICIENCY DOSAGE - 64 oz treats up to 240 gallons—maximize engine care with minimal effort.
OEM BACKED RELIABILITY - Trusted and approved by industry giants like GM, Ford, Deere & Navistar.
PROVEN PERFORMANCE BOOSTER - Boosts horsepower, torque, and fuel economy with every use.
UNIVERSAL DIESEL ENGINE COMPATIBILITY - Works seamlessly with all diesel engines—on-road, off-road, and marine.

Stanadyne Diesel Performance Formula 38566 is a premium, all-season additive designed to enhance diesel engine performance by improving fuel economy, horsepower, and torque. Approved by major OEMs including GM, Ford, Deere, and Navistar, it meets the rigorous Cummins L10 cleanliness standard and treats up to 240 gallons of diesel fuel per 64-ounce jug, making it the trusted choice for universal diesel engine protection.

Specifications

ASIN	B000M5QPSY
Automotive Fit Type	Universal Fit
Best Sellers Rank	#19,438 in Automotive ( See Top 100 in Automotive ) #31 in Diesel Additives
Brand	Stanadyne
Brand Name	Stanadyne
Compatible with Vehicle Type	All Diesel Engines: On Road - Off Road - Marine
Container Type	Can, Jug
Customer Reviews	4.8 out of 5 stars 772 Reviews
Item Highlight	Part # 38566
Liquid Volume	64 fluid ounces
Manufacturer	Stanadyne
Manufacturer Part Number	38566
Model Number	5
Package Information	Can, Jug
Part Interchange Info	38566
Size	64oz
UPC	753167924442 026508385661
Unit Count	64 Fluid Ounces
Vehicle Service Type	All Diesel Engines: On Road - Off Road - Marine

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