Turbocharger Oil Return Pipe 5135786AB for Cummins ISB/ISD/QSB Diesel Engines 2003–2013Product Overview Part Name: Turbocharger Oil Return Pipe Part Number: 5135786AB Vehicle Compatibility: Cummins Diesel Engines ISB, ISD, and QSB engines used in heavy duty trucks, buses, and off road machinery (20032013). Configuration: OEM style turbo oil return pipe engineered for Cummins engines, designed to route excess oil safely back to the sump. Function: Provides a leak free passage for lubricating oil returning from the turbocharger to the oil