The best time to add Power Service diesel additives is while you are filling up with fuel to ensure the quickest mixture of the additive to the fuel. However, the recirculation of fuel back to the engine means proper mixture will occur regardless of the time the product is added.

No, Power Service manufactures diesel fuel additives and they should only be added to the fuel. Power Service does not manufacture DEF. Do not add any Power Service diesel fuel additive to the diesel exhaust fluid tank.

Yes, all Power Service products are compatible and can be used simultaneously. Many customers use Diesel Kleen +Cetane Boost for performance improvements even during cold weather and add Clear-Diesel Fuel & Tank Cleaner before winter to help prevent icing issues. Diesel 911 can also be used together with other Power Service products if needed. Always follow the instructions on each container for best results, as using less than the recommended amount may impact performance.

Yes, Diesel Fuel Supplement +Cetane Boost effectively treats biodiesel blends and the directions can be found on the container label. Keep in mind that biodiesel can have winter operability problems at temperatures higher than standard petroleum diesel. Refer to your owner’s manual for the biodiesel specifications recommended for your vehicle. Having Diesel 911 on hand for winter emergency use is always a good idea.

Currently, only Power Service Diesel Kleen and Diesel Fuel Supplement are endorsed by Cummins. While the other Power Service diesel additives are not specifically endorsed by Cummins, they are safe and effective for use in all diesel engines. In fact, Cummins dealers have access to and can sell the entire line of Power Service diesel additives.

Cetane is a powerful energy compound that improves the ignition quality of fuel. There is a direct relationship between a diesel fuel’s cetane number and its ignition point. The lower the cetane number, the longer the ignition delay. Fuels with high cetane numbers burn more quickly and more completely, resulting in smoother and quieter running engines, quicker engine starts, more power and improved fuel economy. In fact, The Engine Manufacturers Association (EMA) states, “Fuels with low cetane numbers will cause hard starting, rough operation, noise and exhaust smoke. Generally, diesel engines will operate better on fuels with cetane numbers above 50 compared to fuels with cetane numbers of the national average of 46.”

When used as directed, use of Power Service diesel fuel additives will not void any engine manufacturer’s warranty.

Yes, Power Service diesel additives are safe for use in any diesel engine.

Diesel Fuel Supplement +Cetane Boost (in the white bottle) is a winterizer/antigel for use when temperatures drop below 30°F. for winter operability. Diesel Kleen +Cetane Boost (in the silver bottle) is an injector cleaner and performance improver for use when temperatures are above 30°F. Use our seasonal tip to help remember which product to use: “White for winter, silver for summer.”

The Arctic Formula of Diesel Fuel Supplement +Cetane Boost prevents fuel gelling and protects against fuel-filter icing. The Winter Rescue Formula of Diesel 911 is used when gelling or icing has already occurred and the engine won’t start. Use Diesel 911 to get your engine running and then add Diesel Fuel Supplement +Cetane to prevent future gelling.

No, it will not hurt your engine to use Diesel Fuel Supplement +Cetane Boost (in the white bottle) year-round. However, for maximum performance we recommend using Diesel Kleen +Cetane Boost (in the silver bottle) when temperatures are above 30°F. (Use our seasonal tip to remember white for winter and silver for summer.)