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 all-season protection

€ 129.35

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Description

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

OEM APPROVED RELIABILITY - Trusted and recommended by industry leaders like GM, Ford, Deere & Navistar for year-round engine protection.
PROVEN PERFORMANCE BOOST - Enhances fuel economy while increasing horsepower and torque, backed by independent testing.
ADVANCED DETERGENT CETANE FORMULA - Cleans fuel systems and improves combustion efficiency to keep your engine running smoother, longer.
UNIVERSAL DIESEL ENGINE COMPATIBILITY - Works seamlessly with all on-road, off-road, and marine diesel engines for ultimate versatility.
FLEXIBLE DOSING FOR MAXIMUM PROTECTION - Safe to blend or double-dose without harm, ensuring you never miss out on peak diesel performance.

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 including GM, Ford, Deere, and Navistar, it improves fuel economy, horsepower, and torque while protecting engines year-round. Featuring a powerful detergent and cetane improver, this all-season formula ensures cleaner fuel systems and superior combustion, making it a trusted choice for all diesel engines—on-road, off-road, and marine.

Specifications

ASIN	B000M5QPSY
Automotive Fit Type	Universal Fit
Best Sellers Rank	#21,283 in Automotive ( See Top 100 in Automotive ) #34 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 769 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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€ 129.35

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered 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 GERMANY.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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