Posted: July 13, 2026

Common Diesel Fuel Additives and Their Benefits

6 Ways Additives Boost Performance and More

When it comes to fueling heavy-duty vehicles, it’s all about power. Gasoline just doesn’t deliver the torque that’s needed to handle all that hauling, pushing, and pulling power. Think dump trucks, farm equipment and construction vehicles, as well as those long-haul 18-wheelers. Those types of fleets require the power of diesel fuel. But power alone is not always enough. Just like gasoline, diesel fuel can benefit from additives that help enhance performance, reduce emissions and prolong the life of engines. Here’s everything you need to know.

Benefits of Diesel Additives

The main categories of diesel fuel additives include cetane improvers, which help with ignition rates, lubricity enhancers, fuel stabilizers, detergents, antigel agents, and biocides. Each type offers unique benefits, making diesel fuel more efficient and engine-friendly for both on-road and off-road diesel engines.

1. Enhanced combustion efficiency: Cetane improvers increase the cetane number of diesel fuel. The cetane number measures the fuel’s ignition delay, or the time between fuel injection and combustion. Higher cetane numbers result in shorter ignition delays, leading to more efficient combustion. Improved combustion enhances engine performance, providing smoother acceleration and better fuel economy. For on-road vehicles, this means reduced fuel consumption and lower operating costs.
2. Engine protection: Modern diesel fuels, particularly ultra-low sulfur diesel, are better for the environment, but they tend to provide less lubrication. This can increase wear and tear on fuel injectors and other components. Lubricity additives improve the lubricating properties of the fuel, reducing friction and wear, and helping extend the life of engine components.
3. Cleanliness and maintenance: Detergents help prevent the buildup of deposits in the fuel injectors and combustion chamber. Clean injectors ensure proper fuel atomization, which is critical for efficient combustion. Regular use of detergent additives can reduce emissions, improve overall engine performance, and result in fewer maintenance issues.
4. Cold weather performance: Antigel additives are particularly beneficial for off-road diesel engines operating in cold climates like ours. Low temperatures can cause diesel fuel to gel, resulting in fuel flow issues and starting problems. Antigel agents help prevent these issues and ensure reliable engine operation in cold conditions.
5. Fuel stability and storage: Off-road diesel is often stored for extended periods, leading to fuel degradation. Fuel stabilizers prevent oxidation and the formation of sludge and varnish, ensuring that it remains usable over long storage periods. This is especially important for emergency generators, seasonal equipment, and other situations where you may not use off-road diesel immediately.
6. Preventing microbial growth: Biocides prevent microbial growth in diesel fuel. Water contamination in diesel storage tanks can lead to the growth of bacteria and fungi, causing fuel contamination and system clogging. Biocides eliminate these microorganisms, ensuring clean fuel and preventing costly downtime for off-road machinery.

We Make It Easy

Find out why Mercer Landmark is the go-to for all your commercial fueling needs. Whether you operate a range of construction or agricultural vehicles and equipment essential to getting heavy work done, or a fleet of vehicles that move people, materials or merchandise, the team at Mercer understands the unique challenges that businesses in this region face. Find out why you can count on our commercial energy experts to provide top-notch delivery of high-quality diesel, gasoline and propane, as well as heavy-duty lubricants, engine oils and everything you need to keep your operation running smoothly.

Contact us today for information about fleet fueling services and more.