Mercury High Performance Gear Lube SAE 90 For use in all lower units, jet pumps, Sport Jets, and all Mercury MerCruiser sterndrives. Provides the proper corrosion protection and lubrication needs of marine gear cases not found in automotive-based oil. This gear lube provides maximum protection against Water Intrusion Advanced emulsifiers prevent foaming to protect gears if water enters the gear housing. Wear Tackifiers and extreme pressure additives improve oil film adhesion and protect against