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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⚡ Elevate your diesel game — power, efficiency, and protection in one bottle!

POWER UP YOUR DRIVE - Unlock up to 10% more horsepower for that extra edge on the road.
JOIN THE ELITE FLEET - Trusted by professionals who refuse to settle for average performance.
ENGINE TLC IN EVERY DROP - Lubricates and cleans critical engine parts to extend diesel engine life.
FUEL SMARTER NOT HARDER - Improve fuel efficiency by up to 5%, saving money and reducing emissions.
MADE FOR THE MODERN DIESEL - Precision-formulated in the USA to meet the demands of today’s high-performance engines.

Stanadyne Diesel Performance Formula (64 oz) is a premium additive designed to boost diesel engine horsepower by up to 10%, improve fuel economy by up to 5%, and provide superior lubrication and cleaning to protect engine components. Made in the USA, it’s the go-to solution for professionals seeking enhanced performance and longevity from their diesel vehicles.

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Manufacturer	0
Brand	Stanadyne
Product Dimensions	15.24 x 7.62 x 24.13 cm; 1.72 kg
Item model number	5
Manufacturer Part Number	38566
OEM Part Number	38566
Manufacturer	0
Country of Origin	USA
Item Weight	1 kg 720 g

STANADYNE DIESEL PERFORMANCE FORMULA - 64 OZ.

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