NEW // WINTER FLOW 24/7

Cold starts don't stand a chance.

Anti-gel, filter de-icer, and cetane boost in one bottle. Pour it in at every fill-up and the cold never gets a head start. One bottle treats up to 200 gallons.

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Dual-chamber bottle with a built-in measuring cup. No extra tools needed.
Protects to 15°F standard dose Treats up to 200 gallons Made in the USA
DOC'S QUALITY PROMISEUS-DESIGNED. US & GLOBALLY MADE.
FREE U.S. SHIPPINGORDERS OVER $99*
30 DAY WARRANTYMONEY BACK GUARANTEE
U.S.-BASED SUPPORTREAL HUMANS. REAL FAST.
SHIPS FROM OHIO U.S.FAST DOMESTIC FULFILLMENT
LAB-TESTED FORMULABUILT FOR REAL WINTERS
DOC'S QUALITY PROMISEUS-DESIGNED. US & GLOBALLY MADE.
FREE U.S. SHIPPINGORDERS OVER $99*
30 DAY WARRANTYMONEY BACK GUARANTEE
U.S.-BASED SUPPORTREAL HUMANS. REAL FAST.
SHIPS FROM OHIO U.S.FAST DOMESTIC FULFILLMENT
LAB-TESTED FORMULABUILT FOR REAL WINTERS

Why Winter Flow 24/7

Four Jobs. Every Fill-Up.

Prevents Gelling & Icing

Stops paraffin wax from forming in cold diesel and keeps water from freezing in your fuel filter, so fuel keeps flowing all winter.

Improves Cold Starts

No gelled lines and no frozen filter means your truck turns over on the first try, even after a night below freezing.

Boosts Cetane

Faster ignition and smoother cold starts, even after the temperature drops overnight.

Lubricates The Fuel System

Adds back the lubricity that ultra-low sulfur diesel strips out, protecting your injectors and fuel pump.

Shop Winter Flow 24/7

Winter Flow 24/7 bottle packed in snow
Winter Flow 24/7 on a garage workbench
Winter Flow 24/7 2-pack in the shop
Doc's Diesel Winter Flow 24/7 Diesel Treatment + Cetane Boost

New for winter

Winter Flow 24/7 Diesel Treatment + Cetane Boost

No gelled fuel, no frozen filters, and no stranded mornings. Easier starts, a cleaner-running engine, and one less winter worry.

  • Prevents fuel gelling and waxing in freezing temperatures
  • De-ices fuel filters before ice cuts off fuel flow
  • Boosts cetane for faster, smoother cold starts
  • Protects to 15°F at standard dose, 0°F and below at extreme dose
  • One 16oz bottle treats up to 200 gallons
  • Made in the USA and quality tested for winter

Subscribe & Save: get a free bottle of 24/7 Diesel Treatment on your 2nd subscription order. Cancel anytime in one click. Subscribe on the product page

Free contiguous U.S. shipping on orders $99+. 30-day money back warranty.

How To Use It

Add it at every fill-up through the cold months, starting before the first freeze. Diesel starts waxing at 32°F, so treat your fuel before the temperature drops, not after. The dual-chamber bottle measures the dose for you.

Built-in measuring chamber on the Winter Flow 24/7 bottle

Standard use

2oz per 25 gal

Protects down to 15°F (-9°C). Your everyday winter dose.

Performance boost

4oz per 25 gal

For below 0°F or sustained severe cold. Same bottle, double the dose.

Safe for all diesel engines, including pickups, semis, farm equipment, and off-road machinery. Always follow the dosage directions on the label and your manufacturer's fuel treatment guidance.

Winter Flow 24/7 FAQs

Standard dose (2oz per 25 gallons) protects down to 15°F. For sustained cold below 0°F, double the dose to 4oz per 25 gallons for extreme protection.

Start before the first freeze. Diesel begins waxing at 32°F, so treat your tank ahead of the cold snap, not after it hits.

One 16oz bottle treats up to 200 gallons at the standard dose (2oz per 25 gallons). The dual-chamber bottle has a built-in measuring cup, so there's nothing extra to buy.

Yes. It's safe for all diesel engines, including pickups, semis, farm equipment, and off-road machinery.

Winter Flow 24/7 is built for cold weather. On top of the cetane boost and lubricity, it adds anti-gel protection and fuel filter de-icing, so it's the one to run once temperatures start dropping.

$23.99 for a single 16oz bottle, or $45.99 for a 2-pack. Subscribe & Save and your 2nd subscription order includes a free bottle of 24/7 Diesel Treatment.