Master Plus 500 CI-4/SL SAE 15W 40 is specifically formulated with a blend of highly refined Group-II base oils and specially selected additives to provide excellent performance in all recommended applications. It is a long drain and energy conserving Oil. Master Plus 500 Cl-4/SL SAE 15W 40 is a high performance multi-viscosity SAE (15W 40) crankcase lubricant.