Diesel 1 vs. 2 – Know the Differences

A crucial part of vehicle maintenance is getting the right fuel. If you own a diesel engine, you should choose the best fuel grade suitable for your driving conditions. Which diesel grade should I go for? To answer this question, we draw your attention to diesel 1 vs. 2.

The main difference between the two diesel types is the cetane rating, which indicates combustion speed. This rating is similar to the octane rating of gasoline, a crucial contrasting point in the diesel vs. gasoline discussion.

What are the differences between diesel 1 and 2? Which one is the best and why? Sit tight as we address these queries and many more relevant ones.

is off road diesel 1 or 2

Diesel 1

Diesel 1 is premium diesel, which is very efficient, evident from its short ignition delay. The result is less wear on the car battery, and the engine will run smoothly. Another defining feature of diesel 1 is its lightness, making it more volatile. The volatility makes it suitable for winter driving. 

Considering that it is premium fuel, it has additives, such as lubricants, that ensure parts of the fuel system move effortlessly. The lubrication extends the life of the parts, which would otherwise wear fast due to wear and tear from friction.

Additionally, diesel #1 contains detergents that help clean components like the injectors, which may have debris accumulated after lengthy use. Demulsifiers in this fuel will separate water away and prevent engine problems.

This premium diesel may also have corrosion inhibitors that act against rust and other corrosive agents. Its stabilizers will prevent clogging. In short, diesel 1 is good for your engine’s well-being and driving in cold conditions. So many perks of diesel 1 come at a hefty price but it is costlier than the standard fuel.

Diesel 2

What is diesel 2? It is the standard diesel you find in most gas stations. Its primary advantage is that it is affordable and readily available. Also, it has more energy components that will lubricate engine parts and prevent their wearing due to rust and friction. 

Besides lubricants, it has emulsifiers and stabilizers that ensure your engine is in excellent shape. On engine protection, diesel 2 fares better than diesel 1 due to its paraffin content.

Diesel 2 is suitable for driving in warm weather. It is less volatile than diesel 1; thus, it is suitable for heavy-duty applications, such as long-distance trucking, as it can sustain constant speeds.  

Diesel 1 Vs. 2 Differences

We now focus on diesel #1 and #2 differences, where we look at various parameters, as highlighted below.

Diesel 1 Is Lighter

Diesel 1 lacks energy components, such as paraffin wax, making it lighter. The lightness translates to volatility and low viscosity.

On the other hand, diesel 2 has plenty of energy components; as such, it is heavier and denser.

Diesel 2 Is Ideal for Engine Protection

As previously mentioned, diesel 2 has several energy components contributing to its density. The components protect the engine from wear and tear brought by friction and corrosion.

Diesel 1 For Winter Driving

Diesel 1 is a premium class fuel courtesy of its all-weather performance. It lacks components like paraffin, which crystallizes in low temperatures, resulting in a difficult cold start. Diesel 1 will flow flawlessly; hence the engine starts without any problems.

While diesel 2 is not ideal for winter conditions, it performs well in heavy-duty vehicles.

Diesel 1 vs. diesel 2 price

Diesel 1 is pricier than diesel 2 and is available in select gas stations. Diesel 2 is the regular diesel you find in most outlets. 

Can you mix diesel 1 and 2? Winterized diesel fuel is a blend between diesel 1 and 2, with more diesel 1. You can use it all year, where you benefit from the winter performance of diesel 1 and the engine protection properties of diesel 2.

Is off-road diesel 1 or 2? Off-road driving requires red or green diesel. The color codes show the designation of the fuel; red and green diesel is not for on-road use and attracts lower levies. On the best diesel for off-road use, diesel 2 is the perfect fit, as it will help maintain the engines with a high workload.

can you mix diesel 1 and 2


Is Diesel 2 Better?

Diesel comes in various grades, and you will find types like diesel 1 and diesel 2, each with its selling points. For instance, diesel 1 is light and less viscous; as such, it is suitable for winter driving due to its low gelling factor. On the flip side, diesel 2 is better for typical warm weather driving. It is cheap and has additives like lubricants that will protect your engine. 

What Is 1 Diesel Used For?

1 diesel grade is the best option for driving in cold conditions. Unlike the standard #2 diesel, it does not gel when temperatures dip, making the engine hard to start. Diesel 1 performs well in winter due to removing components, like paraffin, making it less dense.

Can You Run Straight 1 Diesel?

Straight-run diesel is the product attained from the distillation column. You can use straight-run diesel for off-road use but not for on-road use. More processes come into the picture to get diesel 1 from straight-run diesel, such as removing paraffin wax to reduce the fuel’s viscosity. The light product at the end of the process is suitable for winter driving due to its volatility and less susceptibility to gelling when temperatures drop.

When Should I Start Using Number 1 Diesel?

You should always pick the right fuel for your car depending on the driving conditions for a smooth driving experience. For diesel engines, diesel 1 is an excellent pick for winter conditions due to its low viscosity. Unlike diesel 2, it won’t crystalize when it gets extremely cold. Diesel 2 is ideal for standard driving conditions, especially on heavy-duty diesel engines.

Which Diesel Fuel Is the Best Quality?

Many auto pundits consider Diesel 1 to be the best, courtesy of its winter performance. Its redeeming factor is that it remains stable in the cold; as such, the engine starts effortlessly. Furthermore, this type of diesel may contain additives like lubricants, detergents, and stabilizers for engine health. It is available in select gas stations and is costlier than the typical fuel. 

While diesel 2 is a standard fuel, it does an excellent job in engine protection. It has paraffin wax, a lubricant that prevents engine wear and tear.

Do I Need to Put Additives in Fuel in Winter?

Driving in winter can be challenging due to poor roads, poor visibility, and freezing or gelling fuel. The last situation comes because of the presence of paraffin in oil. Fuel gelling can make it hard to flow, resulting in a delayed cold start. At times, the vehicle may completely fail to start.

A solution to this problem is putting additives in fuel. The additives, such as anti-gel, prevent the fuel components from solidifying, allowing for easy flow. Also, the additives expel water from fuel, which can freeze and clog the fuel line. Emulsifiers come into the equation to capture water and remove it from the engine. 

Moreover, the fuel additives protect the engine by improving lubrication and curbing corrosion.

Is It OK To Use Winter Diesel in The Summer?

Winter diesel has a lower viscosity than typical diesel, meaning it can withstand cold conditions without crystallizing. You can use it all year round as less viscous fuel flows fast, resulting in a smooth drive. The downside is that it may be expensive to use. 

Final Word

The diesel 1 vs. 2 debate brings to light two diesel grades, focusing on their functionality. We learn that diesel 1 is suitable for winter driving due to its volatility, achieved by eliminating paraffin wax. Diesel 2 has the paraffin content intact, translating to excellent engine protection. Plus, it is cheaper than its counterpart.

Beat the winter by resorting to diesel 1 and go for diesel 2 for heavy-duty uses in warm weather. 


Hi there, I am R. Hasan Tito, a mechanic, and owner of this website. My friend and I created this website to share our knowledge, expertise, and experience with our fellow mechanics' community and car users. I am a specialist and certified automotive mechanic (Both Heavy Commercial and Private Cars). I worked as a Mechanic and Mechanic Supervisor for over fifteen years at Global Rebound Automotive companies - Toyota, TATA, BMW, Nissan, TVs, and Others. Now, I enjoy my new role of leading a team of automotive experts (in their respective fields) and publish new content on a regular basis on my website and social media.

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