What to do About Frozen Diesel Fuel

frozen diesel - dodge ram

What if I told you AMSOIL has a product that provides as much as 32ºF better protection against cold-temperature diesel fuel gelling than Howes Lubricator Diesel Treat*? You know – Howes, one of the largest diesel fuel additive companies in the U.S.

Are you listening now? I thought so.

What causes frozen diesel fuel?

Diesel fuel naturally contains a beneficial waxy material, provided it remains liquid. As the temperature drops, however, the wax solidifies into a snow-cone-like material, like what your kids eat at the state fair. Your fuel system will struggle to pump this material, eventually starving the engine of fuel and leaving you stranded. The video below shows how frozen diesel fuel can clog your fuel filter.


The fuel refineries do a pretty good job of blending winter-rated diesel fuel that avoids gelling. But they typically base the rating of the fuel on temperature projections that don’t leave room for sudden and violent temperature swings. If you find yourself checking the weather on your phone and the outlook calls for blustery, cold temps, it’s possible the fuel at the station where you plan to fill up the next morning doesn’t yet have fuel blended for the temperatures in the forecast.

Why tempt fate? There are better options, and AMSOIL has the chemistry to protect your vehicle and your schedule from drastic setbacks.

Let’s be smarter and turn the mirror on ourselves. There is chemistry available that ensures the wax in your fuel stays liquid so your fuel system can pump fuel to the engine. We call these additives cold-flow improvers, and AMSOIL Diesel All-In-One is loaded with them to ensure you don’t run into these issues.

So how are we better than Howes, you ask?

In the fuel industry there is a test called the Cold-Filter-Plugging-Point Test. It measures the coldest temperature at which fuel will flow without plugging a filter. In independent testing, AMSOIL Diesel All-In-One repeatedly flowed at temperatures up to 32ºF colder than the Howes product*. That is a substantial difference in performance when it matters most.

frozen diesel - cold filter plugging point graph

Some might say, “That doesn’t matter…Howe’s has a free-tow guarantee that’ll cover me if I’m ever stranded.” That’s no guarantee; that’s an insurance policy, and they hope not to use it. If you want a real guarantee, use AMSOIL Diesel All-In-One to ensure you don’t have to call for a tow.

More than excellent cold-flow

AMSOIL Diesel All-In-One doesn’t just give you optimum chemistry for cold weather. Oh, no sir/ma’am. It also delivers…

  • Optimum detergency to help keep the fuel injectors and combustion chamber clean
  • Lubricity to lubricate the fuel pump and injectors
  • A four-point cetane boost to provide extra help at startup and improve combustion efficiency for improved power and fuel economy

Diesel All-In-One gives you the best chemistry on the market at a concentration that makes a difference.

If you’re like most, you look for opportunities to make life easier. When the temperature dips below freezing, treat your diesel fuel with AMSOIL Diesel All-In-One for the protection your vehicle and your pocketbook need.

*Based on independent testing in July 2017 of AMSOIL Diesel All-in-One and Howes Lubricator Diesel Treat using diesel fuel representative of the U.S. marketplace and Howes’ recommended treat ratio for above 0°F.

Updated. Originally published: December 19, 2017


  1. I like what you said about the fact that changing weather conditions can affect whether the fuel is prepped for the colder weather. I would imagine that it really depends on how on top of things fueling stations are, particularly in places like Alaska and Canada, where colder conditions are expected. If I owned a different kind of vehicle, I’d want to make sure that the fuel was right for it, especially if it was being used for a business or industry.

  2. One of my customers was using All In One and his fuel gelled at just 26 below F. What are we going to do when it gets cold? It was recently bought fuel from a top tier supplier with a high turnover.

    1. Hi Ed,

      I’m sorry to hear your customer still had fuel-system issues while using our product. Our Diesel-All-In-One is super-concentrated to provide the best opportunity to keep your fuel flowing to the engine. Please ensure your customer treated his tank with our product and then filled up with fuel to help mix the additive. Additionally this product is to be used proactively, so if the temp dropped and your customer poured the product on top of a full tank hoping it would help, it’s possible the fuel had already gelled. In these cases, our Diesel Recovery is the right product. If your customer used the product correctly, then it’s possible the fuel from the station was untreated summer ULSD #2 fuel. If that is the case then our additive on top of summer fuel will not likely keep the truck from gelling down to -26F since summer fuel has a cold-filter plugging point well above 0F.

    1. Hi John,

      We used the treat rate most often recommended by Howes. It’s the treat rate they use heavily in their marketing, the most prominent on their packaging and datasheets, and the most cost-effective solution for their customers. Given those reasons, we chose that treat rate as it’s most likely the treat rate many of their customers use.

  3. Good article Mark. I have to add my experience with the Diesel All In One. I bought #2 diesel fuel for my semi truck. Don’t know the quality of it as cold filter plug point (gel point) temperature can vary from fuel stations. It got down to 7°F, truck not plugged in all night. It fired right up and didn’t have any problems!! This truck is known for being cold blooded also.

    Thanks for the great products!

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