Cummins Filtration gets frustrated when it encounters an unclean machine. The subsidiary of engine manufacturer Cummins is among the world's largest makers of engine-related component products. Cummins Filtration's 7,000-plus offerings include filtration, coolant, and fuel additive products, filters for air, fuel, lube, chemicals, exhaust system technology products, hydraulics, and other filtration systems. Marketed under the Fleetguard brand, the lineup is used primarily on heavy- and medium-duty diesel trucks, in addition to construction, mining, agricultural, marine, and power generation equipment.