Cold weather ahead?
Choose a preventive treatment while your fuel is still liquid. Cold Flow and 4-IN-1 are the winter-prevention options.
Explore prevention →Winter-ready starts in the tank
Diesel Fuel Treatment for Cold-Weather Protection
Find the right AMSOIL diesel treatment for the road ahead, from preventing fuel gelling to getting prepared for a winter emergency.
Product guidance from a longtime independent dealer.
Buy directly from AMSOIL using our dealer links.
THE COLD-WEATHER LINEUP01 / 03
PREVENT. Before fuel gels.RECOVER. When it has.
Longtime independent dealerA real person for product questions
Direct from AMSOILU.S. and Canadian buyers welcome
Official product documentsDirections, data sheets & SDS
Start with your situation
What does your diesel need?
Cold-flow protection, emergency recovery and everyday fuel care do different jobs.
Fuel already gelled?
Prevention is no longer the same task. Learn about Diesel Recovery and the official tank-and-filter procedure.
Explore emergency recovery →Daily fuel-system care?
Compare cleaning, lubricity and cetane options. These benefits alone do not mean a product prevents gelling.
Compare all six additives →Purpose-built fuel care
Browse all products →One lineup. Different jobs.
Diesel 4-IN-1
All-season treatment combining injector cleaning, lubricity, cold-flow improvement and cetane enhancement.
Explore ADB →
Not ready to order?
Take time to review the AMSOIL catalog.
Request it online through AMSOIL using dealer number ZO 313120, or email us if you would prefer a printed copy.
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Ask your independent dealer.
Read the directions.
Understand the difference.
A cold no-start does not automatically mean gelled fuel. Identify the problem, use the correct product and follow the vehicle and additive instructions.
Official product PDFsHave a product question? You can contact our dealership directly. We’ll help you navigate the lineup and find the manufacturer’s information.
Ask a product questionDiesel anti-gel, recovery or everyday treatment?
Choose by the condition of the fuel and the purpose of the treatment. Start with the question that brought you here, then use the product page to check the label and official technical documents.
- What temperature does diesel gel?
- When should I add diesel anti-gel?
- How can I recognize a possible gelling problem?
- Can gelled diesel be returned to a liquid state?
Questions before you buy
Which diesel fuel treatment helps prevent gelling?
Compare Diesel Cold Flow for dedicated cold-flow protection with Diesel 4-IN-1 for a combined routine. Choose prevention before fuel gels. Use the current package directions for the fuel volume and conditions.
What if the diesel fuel is already gelled?
Read the Diesel Recovery guidance. Preventive anti-gel and emergency recovery have different jobs. A cold no-start can also have other causes, so identify the problem rather than assuming every winter starting issue is gelled fuel.
Do injector cleaners also prevent diesel gelling?
Do not assume they do. The cleaning and cetane products in this lineup are separate from the two preventive cold-flow choices. Use the comparison page to match the intended function to the product.
Where do I buy and check delivery?
Our product links take you to AMSOIL with dealer identifier 313120. AMSOIL shows current prices, available packages and delivery estimates. This site does not hold local stock or provide roadside delivery.
Which diesel treatment do I need?
Answer up to three questions about gelled fuel, cold-weather protection and routine fuel care.
Find my treatment