Keep your boat's performance at its peak with Synthetic SAE 75W-90 Marine Gear Oil, engineered for lower units, gearboxes, and stern drives in demanding marine environments. Formulated with advanced synthetic additives, this marine-grade lubricant offers strong protection against rust, corrosion, and moisture intrusion, delivering confidence in both freshwater and saltwater conditions. Its high viscosity index ensures consistent lubrication under extreme pressure and high temperatures, helping extend gear life. By reducing friction, wear, and foaming, it supports smoother gear engagement and quieter operation, so you spend less time worrying about maintenance and more time enjoying the water. Available in 1, 2, 4, 6, and 12-quart pack sizes, making it convenient for single-engine applications or multi-boat servicing. A dependable choice for marine engines and gear systems requiring SAE 75W-90 synthetic gear oil.