SIERRA HI-PERFROMANCE SYNTHETIC LOWER UNIT GEAR LUBE reduces operating friction for increased performance and protection of gears,bearings,and other gear case components.Recommended for use in high performance and highload operating conditions in both outboard and I/O lower unit.Sierra Hi-Performance gear lube has been designed to surpass the performance of the O.E. Hi-Performance gear lubricants. Alternate part numbers: Sierra 8-96505, SIE_96505, SIE-96505, SIE96505, 47-96505