Power Service 03128-04-4PK Diesel Kleen with Concentrated Cetane Boost Formula - 1 Gallon, (Pack of 4) Cleans dirty injectors and prevents injector sticking in all engines, including High Pressure Common Rail (HPCR) systems Boosts cetane up to 6 numbers so engines run smoother with less power lag and faster cold starts; Boosts power and reduces need for downshifting during high-load conditions Improves fuel economy up to 8 percent - fuel savings exceed cost of additive; Stabilizes stored fuel Contains Slick diesel Lubricator for maximum fuel lubrication that protects pumps and injectors from accelerated wear; Prevents thermal/oxidative breakdown of diesel fuel that protects against sludge formation that plugs fuel-filters and injectors Effective in all diesel fuels, including Ultra Low Sulfur Diesel (ULSD), biodiesel and biodiesel blends