The Donaldson Blue filter line includes more than 150 fuel, air intake, lube and coolant filters designed to meet a wide range of equipment requirements for on- and off-road trucking applications. Donaldson Blue filters offer technology for longer filter life and enhanced engine and equipment protection, reduced maintenance costs and increased equipment time, according to the company. The air filters are available in more than 50 sizes for off-road applications and the fuel filtration systems clean fuel before it's pumped into equipment.