This is from the Power Service Website
White Bottle:
Diesel Fuel Supplement +Cetane Boost is a winterizer/antigel that is used in the cold winter months to prevent fuel gelling and keep fuel-filters from plugging with ice and wax. When temperatures drop, paraffin (wax) in ULSD fuel will gel stopping fuel from flowing through the engine, and water in the fuel can freeze on the facings of fuel-filters, blocking fuel flow. This Arctic Formula provides trouble-free winter operation for diesel fuel.
Diesel Fuel Supplement +Cetane Boost is intended for use only during cold winter months when temperatures drop below +30F. Use 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 Diesel 911 (in the red bottle).
Benefits
Prevents fuel gelling
Protects against fuel-filter icing
Boosts cetane for faster cold starts
Contains Slickdiesel Lubricator to protect fuel pumps and injectors from increased wear caused by Ultra Low Sulfur Diesel (ULSD) fuel
Effective in all diesel fuels, including ULSD and biodiesel blends
Does not contain alcohol of any kind
Safe for use in all diesel engines
Will not void engine manufacturer's warranty when used as directed
Grey Bottle:
Diesel Kleen +Cetane Boost is a total injector cleaner and performance improver that cleans injectors, boosts cetane and lubricates fuel injection components. To realize the benefits of today’s cleaner-burning fuels, new technology is required to maximize performance. This Max HP Formula restores lost power, smooths rough-running engines and improves fuel economy up to 8%.
Diesel Kleen can be used year-round, but it is not a diesel fuel winterizer or antigel. When winter temperatures drop below + 30°F. use Diesel Fuel Supplement +Cetane Boost (in the white bottle) to provide maximum winter protection for your diesel engine.
Benefits
Cleans dirty injectors and prevents injector sticking in High Pressure Common Rail (HPCR) and older systems
Removes deposits on injectors and nozzle tips and prevents future deposits
Boosts cetane up to 6 numbers – engines run smoother with less power lag and faster cold starts
Boosts power – reduces need for downshifting
Improves fuel economy up to 8%
Contains Slickdiesel Lubricator to protect fuel pumps and injectors from increased wear caused by Ultra Low Sulfur Diesel (ULSD) fuel
Effective in all diesel fuels, including ULSD, biodiesel and biodiesel blends
Does not contain alcohol of any kind
Safe for use in all diesel engines
Will not void engine manufacturer's warranty when used as directed