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• The Cummins Particulate Filter consists of four sections: 1. Inlet 2. Diesel Oxidation Catalyst (DOC), 3. Diesel Particulate Filter (DPF) 4. Outlet • Exhaust flows out of the engine and into the Cummins Particulate Filter. It passes through the DOC and then into the DPF where PM is collected on the walls of the DPF.COOLANT FLUSH: Every 30,000 miles FRONT & REAR DIFFERENTIAL: Every 15,000 miles • Brake fluid and power steering fluid should be inspected during every service and flushed accordingly. • Steering components should be lubricated during every oil change service. • Air filter should be inspected during every service and replaced accordingly.