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

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

€ 122.36

Duties & taxes included

In stock

Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

FUEL ECONOMY BOOSTER - Detergent & cetane improver maximizes mileage and power
HEAVY DUTY CLEANLINESS - Meets Cummins L10 Superior Test for superior fuel system cleanliness
PROVEN OEM ENDORSEMENT - Trusted by GM, Ford, Deere & Navistar for year-round engine care
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 diesel additive designed to enhance fuel economy, increase horsepower and torque, and protect diesel engines from fuel-related issues. Approved by major OEMs like GM, Ford, Deere, and Navistar, it treats up to 240 gallons of diesel fuel and meets the rigorous Cummins L10 cleanliness standard, making it the go-to all-season solution for professional-grade diesel engine maintenance.

Specifications

ASIN	B000M5QPSY
Automotive Fit Type	Universal Fit
Best Sellers Rank	#23,082 in Automotive ( See Top 100 in Automotive ) #30 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 (757)
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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