Genuine Ford Fluid PM-22-A ULSD Compliant Cetane Booster and Performance Improver - 20 oz. Ultra low sulfur diesel; meets ULSD compliant Specially formulated for diesel engines to combat the effects of poor-quality diesel fuel Boosts the cetane rating (fuel ignitability) of diesel fuel for improved starting performance Increases power Smoothes engine operation; improves fuel economy and adds lubricity to fuel to reduce engine wear