Does number one diesel freeze?
Diesel #1 performs in cold temperatures.
Diesel #1 is also known as winter diesel because it performs better than Diesel #2 in cold temperatures. It has a lower viscosity and is not prone to gel in freezing temperatures. Most stations offer a premium Diesel mix that is blended for local weather conditions.
Anytime the temperature drops below -30 degrees Fahrenheit, use straight No. 1 diesel.
Diesel fuel gelling has the potential to occur when temperatures drop below 32 degrees Fahrenheit, although the exact temperature it happens at will vary from fuel batch to fuel batch.
No. 1 fuel diesel does not have paraffin wax, and therefore, does not gel at any temperature. While no. 1 diesel fuel will cost slightly more at the pump, it may be worth it to ensure your vehicle or equipment runs smoothly during the winter months.
Diesel #2 is used for trucks that carry heavy loads, while diesel #1 is used for regular driving. Truckers should use diesel #2 because it's the best option for driving long distances at consistent speeds.
Running an engine on pure grade no. 1 diesel fuel continuously could reduce the fuel system's life. Overall, you can use summer diesel fuel before the temperature drops below – 7 °C. Then it's time to switch to the winter blend.
So, when average overnight temps for the location are below or near 24 degrees F, it's time to start a winter treatment with either No1 diesel or with a winter additive.
#1 and #2 grade fuels can be mixed at the same time. This means you don't have to worry if #1 grade is only available during the winter months.
Once you've warmed up the engine, drive outside and diesel fuel won't gel when the engine is running. Even if you're just idling the engine in a cold temperature for a long period of time, the fuel will remain in liquid form.
What Causes Fuel Gelling? This term is pretty self-explanatory, since fuel gelling occurs when the fuel in your tank thickens up enough to look and feel like gel. This only happens when the temperature outside drops below 32 degrees Fahrenheit, though it's most likely to occur at about 15 degrees or lower.
How many hours does it take for diesel to gel?
Gelling occurs when the paraffin wax in diesel solidifies because of a drop in temperature, and the temperature of the fuel generally has to stay below something like minus 10 degrees F for extended periods, like 48 to 72 hours.
- When temperatures are below freezing (32°F) It is always smart to start using anti-gel as soon as temperatures approach freezing. ...
- Rapid drops in temperature. ...
- When you add fuel. ...
- When fuel begins to gel.

Yes. Just because the engine is on and the vehicle is running smoothly doesn't mean that the fuel won't gel. Although the engine warms up as you drive, the fuel tank is located far away from the engine, and it remains cold. This can lead to diesel fuel gelling, even while you're driving down the road.
In one word, NO. Premium diesel is basically regular diesel with some cleaning additives thrown in. They do nothing to enhance the power or fuel economy of your car.
Kerosene is also called #1 diesel fuel oil, whereas regular diesel is designated as #2 diesel fuel oil. Some people consider it similar enough that they may try to use it interchangeably with regular (#2) diesel fuel.
As little as 1% gasoline contamination will lower the diesel flash point by 18 degrees C. This means the diesel fuel will prematurely ignite in the diesel engine, which can lead to engine damage. Gasoline contamination can also damage the fuel pump and mess up diesel injectors.
Winter Fuel
In the winter, normal fuel can form ice crystals that clog the system. Winter blended fuel combats this gelling. Gas stations and fuel companies treat and blend diesel fuel so that it holds up to the lowest temperatures for the current month of the year, making it work better in the winter temperatures.
Diesel fuel can only be stored from 6 to 12 months on average — sometimes longer under the best conditions. Generally, to prolong the life of the quality of stored diesel fuel, it should be: Kept cool at around 70 degrees Fahrenheit; Treated with biocides and stabilizers.
What Happens when you put Diesel in a Gas Vehicle? Since diesel fuel is thicker and denser than gasoline, the fuel pump will struggle to move the diesel/gasoline mixture through the system. Also, the diesel will not be able to easily pass through the fuel filter. Instead, it will clog up the fuel filter.
You can easily add too much of a high-quality diesel fuel additive. What happens when you over-treat your diesel fuel? Overdosing can lead to a whole new list of fuel and engine issues from clogged filters to overall decreased engine performance and efficiency.
Should you let a diesel idle before driving?
Myth: Diesel engines need to warm up at idle for 5 to 10 minutes or more especially on cold days before driving them. Fact: This is one of the most common myths about diesel engines. Most engine manufacturers recommend that newer diesel engines idle for no more than 3 minutes before driving.
The fuel tanks can actually gel while driving. Diesel fuel gelling happens when the paraffin usually present in diesel starts to solidify when the temperature drops. To help prevent this from happening, it is important to always treat your fuel system with a reputable anti-gel additive.
Kerosene will burns fine in most diesel engines without harming them. In fact, many newer diesel engines list kerosene as an approved fuel. Kerosene is made from a distilling process that makes it a pure fuel. This means that it has no additives like diesel does.
It is a common practice for diesel fuel to be blended with kerosene to improve performance characteristics (particularly during cold weather), or other substances, such as used oil to dispose of waste products.
Viscosity. Like all liquids, diesel fuel can be measured by its viscosity or thickness. This is especially important to consider in the winter as diesel can become thicker as the temperature drops. #1 diesel has a lower viscosity which means it's thinner than #2 diesel.
To avoid a diesel from gelling, you can plug the vehicle in using an engine block heater. If you don't have one already fitted to your truck, these can be fitted at your local dealership.
- Remove fuel filters.
- Fill fuel filters with 50% CleanBoost® Diesel Rescue Emergency De-Gel™
- Fill the remaining 50% with diesel fuel.
- Re-install fuel filters.
- Start engine and allow to idle until warm.
Howes Diesel Treat is the nation's most trusted anti-gel. Its special formula has been tested and proven time and again to prevent gelling in even the coldest weather. Owners of all types of diesel vehicles and equipment rely on the Howes family's guaranteed product to keep them going all winter long.
Once temperatures fall between 10 and 15 degrees Fahrenheit, gelling occurs, clogging the fuel tank and fuel lines. At this point, you may have to get your vehicle towed to a garage so your mechanic can fix any ruptured fuel lines and thaw the fuel tank.
You'll know if you have a possible gelling issue when your diesel vehicle will not start or stops operating during cold temperatures. Diesel is comprised of straight and branched-chain hydrocarbons. These kinds of hydrocarbons, also called paraffin waxes, become solid around 17.5 °F for #2 Diesel.
Is it bad to cold start a diesel?
The more cold-starts your diesel is subjected to, the shorter its lifespan will be. Inconsistent metal expansion and poor-flowing (thick) lubricants don't provide protection from moving parts. Another thing to worry about is fuel washing the cylinder walls before compression ignition can occur.
Adding Kerosene
It is a common practice for truckers to mix #1 diesel which has a blend of kerosene with diesel #2 which is used on road applications. Kerosene helps in lowering the plug point temperature of the fuel and reduces its viscosity, therefore making diesel less likely to gel even during low temperatures.
- Hot Shot's Secret Diesel Extreme. This might be the single best overall fuel additive out there. ...
- Lucas Oil Anti Gel. Another popular option suitable for both gas and diesel engines is the Lucas Oil Anti Gel. ...
- Power Service Fuel Supplement.
Keep your anti-gel stored somewhere protected from the elements until you are ready to add it to your fuel. Room temperature is optimal, but anything above 20° F works.
Diesel Exhaust Fluid or DEF Fluid
Whether in storage tanks or in equipment, DEF can freeze and possibly cause issues. As temperatures drop below 12°F, DEF will begin to solidify and not work as intended.
Sea Foam also works as a fuel stabilizer and diesel fuel anti-gel. It can even increase your vehicle's fuel efficiency by removing buildup and deposits from your fuel injectors, pistons, and intake valves.
It may take an hour of idle to thaw the entire line from the fuel tank, to the filter, to the injectors. Fuel Additives: There are now fuel additives that can provide an easy, low cost, and no-hassle solution to prevent gelling; one that any vehicle owner can do on their own.
Use your diesel fuel anti-gel every time you fill up during the winter. Try to remember to add the anti-gel before pumping the fuel. This will help ensure a good mixture of the anti-gel throughout the fuel. This could be a sign that your fuel is gelling.
Diesel #2 is used for trucks that carry heavy loads, while diesel #1 is used for regular driving. Truckers should use diesel #2 because it's the best option for driving long distances at consistent speeds. Diesel #2 is also less volatile and gives better fuel economy.
The cloud point for No. 2 diesel is approximately 14 degrees F. A good rule of thumb is to switch to a winter blend 15 degrees above cloud point.
What is the best diesel fuel additive for cold weather?
- Hot Shot's Secret Diesel Extreme. This might be the single best overall fuel additive out there. ...
- Lucas Oil Anti Gel. Another popular option suitable for both gas and diesel engines is the Lucas Oil Anti Gel. ...
- Power Service Fuel Supplement.
Winter Fuel
In the winter, normal fuel can form ice crystals that clog the system. Winter blended fuel combats this gelling. Gas stations and fuel companies treat and blend diesel fuel so that it holds up to the lowest temperatures for the current month of the year, making it work better in the winter temperatures.
Trucks left sitting still over a couple of really cold days can cold-soak the fuel, causing the wax in the fuel to solidify, giving the fuel a cloudy appearance. Diesel fuel gets cantankerous when the temperature plummets.
Diesel anti-gel prevents the fuel from crystallizing. It drops the freezing point of diesel to ensure that everything runs smoothly. We generally recommend that drivers use some anti-gel once temperatures drop below thirty-two degrees Fahrenheit.
Keep your anti-gel stored somewhere protected from the elements until you are ready to add it to your fuel. Room temperature is optimal, but anything above 20° F works.
Allow Time to Warm Up the Engine
In order to start a diesel engine and keep it running in cold weather, you must make sure you allow plenty of time for your engine to warm up. If you do not let your engine warm up before driving, you will make it work harder than necessary, which will lead to problems later on.