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.