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Pennzoil, QT, Marine Hi Viscosity Gear Lubricant, Special Marine Grade Formulations Designed To Withstand High Amounts Of Water Contamination, Both Contain Stable Extreme Pressure Additives & Corrosion Inhibitors To Protect Gears & Bearings Subject To Corrosion By Water Seepage, Special Anti-Foam Agents Insure Excellent Lubrication To All Gears & Bearings Under The Severe Churning Action Of Marine Gear Cases, Helps Protect Against Rust & Corrosion, Provides Maximum Wear Protection, Antifoam Agents Prevent Oil Aeration Under Severe Gear Churning, Helps Prevent Damage From Water Contamination, Gear Oil Should Be Changed Yearly Before Storing.