1.1 This test method, commonly referred to as the Cummins ISB Test, covers the utilization of a modern, 5.9-L, diesel engine equipped with exhaust gas recirculation and is used to evaluate oil performance with regard to valve-train wear. 1.2 The values stated in either SI units, inch-pound units, or other units are to be regarded separately as the primary units. 1.2.1 For each parameter, the primary units are shown first. Secondary units may b