Hi-Gear's Diesel Fleet products treat up to three times the amount of fuel and deliver greater protection. Diesel Fleet products ensure optimum performance, maximize fuel economy and control engine smoke. Every product in the Hi-Gear Diesel Fleet line offers exceptional lubricity additive packages. All products are ULSD compliant and meet the latest Cummins specifications. Hi-Gear Premium Air Brake Antifreeze is the most powerful protection you can use to help dissolve ice. Premium Air Brake Antifreeze keeps air tanks moisture free and retards rust.