Synthetic blended marine formulation reduces operating friction for increased performance and protection of gears, bearings and other gear case components. Recommended for use in high performance and high load operating conditions in both outboard and I/O lower units. Sierra Hi-Performance gear lube has been designed to surpass the performance of the O.E. Hi-Performance gear lubricants. .. for the finest product available demand Sierra Hi-Performance gear lube.Replaces: Mercury (Quicksilver) Hi-Performance Blend OMC (System Matched) Ultra-HPF Blend Yamaha (Yamalube) LUB-GEARL-11-00