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: 572485623

Details

Brand
Stanadyne
Liquid volume
64 Fluid
Package information
Bottle
SAE J300 Viscosity Grade
5W-30
Vehicle service type
Bus Truck

⛽Universal diesel fuel additive

📊Meets Cummins L10 Superior Cleanliness Test

🛠️OEM-approved for GM, Ford, Deere & Navistar

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Description

⛽ Power your diesel with the ultimate all-season additive—because your engine deserves the best!

PROVEN PERFORMANCE - Outperforms competitors in independent testing for cleaner, efficient fuel systems
PREMIUM 64 OZ CONCENTRATE - Long-lasting bottle designed to keep your diesel engine running smoother, longer
ALL IN ONE DIESEL SOLUTION - Tackles virtually every diesel fuel problem with one premium formula
TRUSTED BY INDUSTRY LEADERS - OEM-approved by GM, Ford, Deere & Navistar for guaranteed compatibility
UNIVERSAL FIT FOR HEAVY DUTY VEHICLES - Perfect for buses, trucks, and all diesel engines needing top-tier care

Stanadyne Diesel Performance Formula 38566 is a 64-ounce premium diesel fuel additive designed to solve virtually all diesel fuel-related issues. Approved by major OEMs like GM, Ford, Deere, and Navistar, it meets the rigorous Cummins L10 cleanliness standard and is proven in independent tests to enhance fuel system performance. Ideal for buses and trucks, this universal-fit additive ensures cleaner, more efficient diesel engine operation year-round.

Specifications

ASIN	B000M5QPSY
Automotive Fit Type	Universal Fit
Best Sellers Rank	78,896 in Automotive ( See Top 100 in Automotive ) 368 in Fuel Systems
Brand	Stanadyne
Brand Name	Stanadyne
Compatible with Vehicle Type	Bus, Truck
Container Type	Bottle
Customer Reviews	5.0 out of 5 stars 2 Reviews
Liquid Volume	64 Fluid Ounces
Liquid volume	64 Fluid Ounces
Manufacturer	Stanadyne
Manufacturer Part Number	38566
Model Number	5
Package information	Bottle
SAE J300 Viscosity Grade	5W-30
Size	64oz
UPC	753167924442 026508385661
Unit Count	1892.7 millilitre
Vehicle service type	Bus, Truck

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