The factory oil pickup tube in your 2nd Gen 5.9L Cummins is responsible for picking up oil from the oil pan and routing the oil through the engine to lubricate it. Overtime, the screen on the bottom of the oil pickup can become clogged due to oil breaking down especially if you are consistently behind on oil changes. Replace your oil pickup tube with a genuine Cummins Replacement Oil Pickup Tube. This is a direct replacement tube that installs using the factory hardware.