Diesel fuel is highly susceptible to changes in its properties due to refinery processing—particularly in the production of low-sulfur fuels—and when blended with bio-components for biodiesel production. These changes can compromise fuel stability and lead to serious operational problems, including filter plugging, injector fouling, injection pump wear, internal corrosion, and incomplete combustion, which may result in black smoke and increased carbon monoxide (CO) emissions.

The ground transportation sector is broad and includes diesel-powered vehicles of many types and sizes, such as trucks, buses, trains, and commercial vans. Across these operations, fuel quality is critical to maintaining vehicle performance, fuel economy, engine reliability, and fleet availability. For passenger transport operators, poor fuel quality can affect schedule reliability, increase maintenance-related interruptions, and compromise service consistency. For cargo carriers, it can increase operating costs, reduce route efficiency, and negatively impact asset utilization. In rail applications, fuel-related issues can affect equipment dependability and operational continuity across demanding duty cycles.

In transportation fleets, even small losses in combustion efficiency can translate into significant increases in fuel cost across large numbers of vehicles. In addition, diesel stored for extended periods may degrade over time, particularly in the presence of biodiesel, increasing the risk of deposit formation, clogged filters, corrosion, hard starts, injector malfunction, and premature wear of fuel system components. These issues can lead to unplanned downtime, higher maintenance frequency, reduced vehicle availability, and greater total cost of operation.

Through highly effective detergent, corrosion-inhibiting, and antimicrobial functionalities, Milex® PX Series performance additives address the primary problems associated with diesel stored for extended periods. These additives help keep fuel systems clean, protect against corrosion, control contamination caused by bacteria and fungi, and reduce deposit formation that can impair engine performance, drivability, and reliability.