High Performance Synthetic Blend Gear Lube by Sierra Synthetic blended marine formulation reduces operating friction for increased performance and protection of gears, bearings and other gearcase components. Recommended for use in high performance engines. 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 Mallory 9-82501 Mercury Quicksilver Hi-P