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Howes Diesel Treat Anti-Gel & Conditioner

The winter fuel insurance that lives in the side box. One 64 oz bottle treats up to 320 gallons.

Updated October 15, 2026

Diesel starts thickening around 34°F and can fully gel at 15°F — plugged filters, a dead truck, and a tow bill. One bottle of preventive anti-gel per winter is the cheapest insurance on the truck, and this is the one the fuel islands have stocked for decades.

How it works

Pour it in before you fuel

Dose it

1 oz per 5 gallons of diesel above 0°F — double the dose below 0°F. Pour it in before fueling so the fuel mixes it for you.

Stretch one bottle

A single 64 oz bottle treats up to 320 gallons above freezing. At typical truck fill-ups, one bottle covers roughly two full tanks.

Keep using it

It's a conditioner, not just an anti-gel — lubricity, water removal, and injector cleaning keep working all year, not only in January.

Why anti-gel matters before the first cold snap

Today's ULSD fuel waxes up faster than the old stuff. Around 34°F the wax crystals start forming; by 15°F untreated fuel can gel solid enough to starve the engine. The failure mode is always the same: filters plug, the truck stumbles, and you're on the shoulder waiting on a tow.

Howes backs the bottle with a guarantee most additive makers won't touch: "You go, or we pay the tow." That's the whole pitch — preventive treatment, every fill-up, before the thermometer drops.

How it stacks up

Preventive anti-gel vs. the other ways to handle winter fuel

	This one: Howes Diesel Treat	Emergency de-gel	Fuel stabilizer	Nothing
Job	Prevent gelling + condition the fuel	Rescue fuel that already gelled	Keep stored fuel fresh	Hope for mild weather
Add it when	Every fill-up, before the cold	After it gels — the truck won't start	Before parking equipment for the season	Never
Cold protection	Preventive anti-gel	Reliquefies gelled fuel after the fact	Mild — built for storage, not driving	None
Water	Demulsifies — pushes water out of the fuel	Check the label	Check the label	Water stays in the tank
Harsh chemicals	None — no alcohol, no harmful solvents	Check the label	Check the label	N/A
Treat rate	64 oz treats up to 320 gallons above 0°F	Follow the label	Follow the label	—
Best for	Daily winter driving	The morning it won't start	Stored equipment	Rolling the dice

The hardware

What you're getting

Size	64 oz (½ gallon) bottle
Treat rate	Up to 320 gallons per bottle above 0°F; whole bottle to 160 gallons below 0°F
Type	Diesel anti-gel + fuel conditioner
Alcohol / solvents	None — no alcohol or harmful solvents
Water	Demulsifies — safely removes water from fuel
Compatibility	All diesel and biodiesel blends to B-20; DPF-friendly; warranty safe
Guarantee	“You go or we pay the tow” — manufacturer's warranty

Specs and dosing are from the manufacturer's own site and listing. We don't invent ratings or reviews — if you want the crowd's verdict, it's on the Amazon page.

Buyer questions

What drivers ask before buying

How much Diesel Treat do I add per fill-up?

The bottle's rule is 1 oz per 5 gallons of diesel when it's above 0°F, and double that below 0°F. One 64 oz bottle treats up to 320 gallons above freezing — for a truck taking on 150 gallons at a time, that's roughly two full fill-ups per bottle.

Do I only use it in winter?

No. The anti-gel is the winter headline, but it's a conditioner year-round: it adds lubricity, demulsifies water out of the fuel, cleans injectors, and cuts smoking and rough idle. Winter is when it saves you; the rest of the year it just maintains the fuel system.

Is it safe for DPFs and modern emissions systems?

Yes — the manufacturer rates it particulate-filter friendly and warranty safe, and safe in all diesel and biodiesel blends up to B-20.

My fuel already gelled — will this fix it?

No, and that's the honest answer: Diesel Treat is preventive, not a rescue. For already-gelled fuel Howes makes Diesel Lifeline, their emergency reliquefier — no alcohol, no filter change needed. Buy Treat before the cold; keep Lifeline in mind for the morning it catches you anyway.

Why does 'no alcohol' matter in an anti-gel?

Alcohol-based additives can dry out seals and drag water through the system. Howes demulsifies water — pushes it out of the fuel — using no alcohol or harmful solvents, which is also why it stays safe for filters and warranties.

Here's the part that matters: anti-gel only works if it's in the tank before the cold hits. A bottle in the side box, dosed at every fill-up from October on, is the difference between a normal January and a tow bill.

You go, or we pay the tow — the only guarantee that matters in January.

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