Why Is a Diesel Fuel Additive So Important?

Diesel fuel quality can vary by supplier, region, season, storage conditions, and fuel type. A good diesel fuel additive helps support fuel quality and can address several concerns that matter to modern and older diesel engines.

Lubricity

Lubricity is one of the most important reasons customers use diesel fuel additives. Fuel pumps and injectors rely on the fuel for lubrication. XL Extreme Lubricant is the best choice when maximum lubricity is the main goal, while XPD All-Season provides strong lubricity as part of a broader all-around formula.

Cetane

Cetane relates to how readily diesel fuel ignites during combustion. A higher cetane number can help with cold starts, smoother operation, reduced ignition delay, and drivability. Boost! is the best choice when maximum cetane improvement is the main goal.

Cold-Weather Performance

Cold temperatures can cause wax in diesel fuel to form crystals that restrict flow, especially at the filter. Winter is designed for severe cold-weather anti-gel protection, while XPD All-Season provides cold-weather support as part of an all-around additive.

Deposit Control

Modern diesel fuel systems operate at high pressures and have very small injector openings. Deposit control helps maintain spray pattern and fuel system cleanliness. Single Clean is a stronger cleaning treatment, while regular maintenance additives help keep the system clean over time.

Water Separation and Corrosion Protection

Water in diesel fuel can cause corrosion, filter plugging, microbial growth, and fuel system problems. Opti-Lube diesel additives are designed to support water separation so the fuel/water separator can do its job.

Need help choosing? Start with Opti-Lube diesel fuel additives or review our FAQ for dosing, storage, and compatibility questions.

How to Prevent Diesel Fuel Gelling in Winter

Diesel fuel can gel in cold weather when wax naturally found in the fuel begins to crystallize and restrict flow. This most often shows up as filter plugging, hard starts, loss of power, or a no-start condition.

Cloud Point, CFPP, and Pour Point

Cloud point is the temperature where wax crystals first become visible in the fuel. CFPP, or cold filter plugging point, relates to when fuel may start plugging a filter. Pour point is the temperature where fuel no longer flows well.

When to Add Anti-Gel

Anti-gel products should be added before the fuel reaches its cloud point or begins to gel. Add the product before or during fueling when possible so it can mix thoroughly.

XPD All-Season vs Winter

XPD All-Season provides cold-weather support as part of an all-around additive. Winter is the better choice when severe cold-weather anti-gel protection is the main concern.

What If the Fuel Is Already Gelled?

Preventative anti-gel products work best before fuel gels. If the fuel is already gelled, use an emergency product such as Gel Melt and follow the label directions.

Need help choosing? Start with Opti-Lube diesel fuel additives or review our FAQ for dosing, storage, and compatibility questions.