HIGH PERFORMANCE GEAR LUBE Quicksilver gearcase lubricant outperforms automotive gear oil in marine applications because of its specialized additive package design.  Continued use of this gear case lubricant will: Provide Maximum protection against excessive wear – even in the presence of water Prevent corrosion and pitting Extend gear life Quicksilver High Performance Gear Lube is recommended for use in marine gear cases with marine engines ABOVE 75 HP.