Dyno-tab ULTRA Fuel Booster is designed for lower sulfur diesel fuel, or any gasoline/petrol that is of low quality or diluted with alcohol. This complete multi-functional additive delivers all the benefits of Dyno-tab and Dyno-tab PLUS, such as reduced friction, wear, emissions and carbon buildup. It increases power and performance, aids in keeping fuel fresh, boosts mileage and has a proprietary lubricant to aid in engine longevity. In the USA, for off-road use only.