Royal Purple 43154 15w40 Multi-Grade Oil Case 3x1 Gallon, 384. Fluid_Ounces Delivers superior protection and enhanced performance due to its unique blend of synthetic oils Enhanced additive technology greatly reduces engine wear and prevents metal-to-metal contact Extremely tenacious, adheres to engine surfaces, and remains after shutdown, providing protection upon initial startup Patented ZDDP additives better protect to optimize the life of your expensive catalytic emission system The performance oil that outperforms