Power Service Diesel Fuel Supplement + Cetane Boost is an diesel fuel anti-gel/winterizer that is used in the cold winter months to keep fuel-filters from plugging with wax and to prevent fuel gelling. This Arctic Formula effectively treats all diesel fuels to keep equipment running trouble-free for maximum winter operability. Power Service Diesel Fuel Supplement + Cetane Boost is intended for use only during cold winter months when temperatures drop below + 30F. Use Power Service Diesel Kleen + Cetane Boost (in the silver bottle) for peak performance in non-winter months. If your vehicle will not start or gain power in cold temperatures, use Power Service Diesel 911 (in the red bottle) as directed on the container label. Power Service Diesel Fuel Supplement Treatment Ratios: