Lucas Oil M8 Synthetic Marine Gear Oil SAE 75W-90

Lucas Oil M8 Marine Gear Oil is a pure synthetic, non-foaming, long-lasting lubricant engineered specifically for marine applications. Originally developed for high-powered offshore racing boats, M8 Marine Gear Oil brings race-proven drivetrain protection to recreational and commercial boaters alike. Its exclusive additive package — featuring seal conditioners and a proprietary blend of synthetic additives — defends against the rust, wear, and corrosion that freshwater and saltwater environments inflict on critical gear components, including during extended periods of off-season storage.

Rated to exceed API GL-5 performance requirements, M8 provides the extreme pressure protection demanded by hypoid gear sets found in sterndrive lower units and other high-load marine drivetrain components. Its thermally stable synthetic base resists viscosity loss at elevated operating temperatures, ensuring consistent lubricity whether running at idle or under full throttle at high RPM.

Key Features:

• Pure synthetic formulation — delivers superior lubricity, extended drain intervals, and consistent performance beyond conventional marine gear oils
• Seal conditioners and exclusive synthetic additive package — protect against rust and wear from both freshwater and saltwater exposure
• Anti-foaming agents — prevent cavitation at high RPMs for reliable lubrication under aggressive operating conditions
• Extreme pressure (EP) resistance — exceeds API GL-5 requirements, protecting hypoid and helical gear sets under the highest load conditions
• Rust and corrosion inhibitors — maintain protection in fresh and saltwater environments and during long-term storage
• Thermal stability — maintains viscosity and lubricity across a wide range of operating temperatures
• Safely blends with all other known gear oils and additives — simplifies top-offs and fluid transitions without compatibility concerns

Trusted for use in heavy-duty and high-performance stern drives, V-drives, gearboxes, wheel bearings, and superchargers, Lucas Oil M8 Marine Gear Oil is the choice of boaters who demand race-derived reliability and proven protection for their most critical marine drivetrain components. Available in multiple container sizes to suit any service need.