MERCURY MARINE Engine Lube

Mercury Marine Engine Lube, Gear Oil & Marine Lubricants

Protect your Mercury engine with Mercury Marine engine lube and lubricants from West Marine. Proper lubrication helps protect critical engine and drive components against friction, wear, corrosion, and the demanding conditions of the marine environment. Shop Mercury and Quicksilver gear lube, lower unit gear oil, marine grease, 2-4-C lubricant, High Performance Gear Lube, Premium Gear Lube, and other lubrication products for compatible Mercury outboards, sterndrives, and marine engines.

Shop Mercury Marine Engine Lubricants

Mercury High Performance Gear Lube

Mercury High Performance Gear Lube is designed to protect gears and bearings in compatible marine gearcases operating under demanding loads. Available under Mercury and Quicksilver branding, High Performance Gear Lube is commonly used in compatible Mercury outboard lower units and MerCruiser sterndrives. Always verify the lubricant specified for your particular engine or drive before use.

Mercury Premium Gear Lube

Mercury Premium Gear Lube provides lubrication for compatible marine gearcases where Premium Gear Lube is specified by the manufacturer. Because Mercury offers different gear lubricants for different engines and drives, check your owner's manual before selecting between Premium and High Performance Gear Lube.

Mercury Lower Unit Gear Oil

Regularly servicing your Mercury outboard lower unit gear oil helps protect the gears, bearings, and other internal gearcase components. Gear lube should be changed according to the maintenance schedule for your specific Mercury outboard and inspected for signs of water intrusion, metal contamination, or other potential problems.

Mercury 2-4-C Marine Lubricant

Mercury and Quicksilver 2-4-C Marine Lubricant is a multi-purpose marine grease used for compatible lubrication points on Mercury engines and boating equipment. It is formulated for marine applications where components can be exposed to moisture and demanding operating conditions. Follow your engine's maintenance instructions to determine where and when 2-4-C lubricant should be used.

Mercury Extreme Grease

For compatible high-load marine applications, Mercury and Quicksilver Extreme Grease provides another lubrication option for specified components. Always match the lubricant to the application listed in your Mercury owner's or service manual rather than substituting lubricants without verifying compatibility.

Mercury Outboard Gear Lube

Gear Lube for Mercury FourStroke Outboards

Maintain compatible Mercury FourStroke outboards with the gear lubricant specified for the engine's lower unit. Routine gearcase service can help protect internal components and provide an opportunity to inspect drained lubricant for signs of water intrusion or abnormal wear.

Gear Lube for Mercury Verado Outboards

Mercury Verado outboards operate under demanding conditions and require the correct lubricant for their gearcase. Use the Mercury gear lube specified for your Verado and follow the service interval and filling procedure provided for your specific engine model.

Gear Lube for Mercury Pro XS Outboards

Protect compatible Mercury Pro XS lower units with the appropriate Mercury or Quicksilver gear lubricant. High-performance engines and gearcases can experience substantial loads, making correct lubricant selection and routine maintenance especially important.

Gear Lube for MerCruiser Sterndrives

Mercury and Quicksilver also offer gear lubricant for compatible MerCruiser sterndrives. Alpha and Bravo drive systems have specific maintenance and lubrication requirements, so consult the documentation for your particular drive before selecting gear oil or performing service.

Mercury Marine Grease & Lubrication

Marine Grease for Outboard Engines

Marine grease is used at specified lubrication points to reduce friction and protect moving components exposed to water and the marine environment. Depending on the Mercury engine, lubrication points can include steering components, swivel brackets, tilt mechanisms, propeller shafts, and other locations identified by the manufacturer.

Mercury Propeller Shaft Lubrication

Routine propeller removal provides an opportunity to inspect the propeller shaft for fishing line, damage, and corrosion. Apply the Mercury-recommended lubricant to the propeller shaft when specified before reinstalling the propeller and associated hardware.

Mercury Steering & Tilt Lubrication

Proper lubrication of compatible Mercury steering, swivel, and tilt components can help maintain smooth movement and protect components from corrosion. Locate the lubrication points for your engine and use the grease specified in your Mercury maintenance documentation.

Mercury Gear Lube Pumps & Accessories

Mercury Gear Lube Pumps

A Mercury gear lube pump can make filling a compatible outboard lower unit or sterndrive easier and cleaner. Pumps and adapters are available for different lubricant containers and gearcase configurations. Follow the correct filling procedure for your engine or drive to reduce the chance of trapped air or improper lubricant levels.

Gear Lube Drain Plug Gaskets & Seals

Small components can be important during lower unit maintenance. Replace appropriate drain and vent screw gaskets or seals when servicing the gearcase according to Mercury recommendations. Damaged or reused sealing components can contribute to lubricant leaks or water intrusion.

Why Mercury Lower Unit Lubrication Matters

Protect Gears & Bearings

The lower unit transfers engine power to the propeller through gears, shafts, and bearings operating under substantial loads. The correct marine gear lubricant creates a protective film between moving surfaces and helps reduce friction and wear.

Help Protect Against Corrosion

Marine engines operate in environments where water and moisture are constant concerns. Using the correct Mercury lubricant, maintaining seals, and servicing the gearcase regularly can help protect internal components from corrosion and premature wear.

Identify Potential Water Intrusion

Changing lower unit lubricant also provides an opportunity to inspect the old gear lube. A milky or unusually cloudy appearance can indicate possible water contamination in the lower unit. If you suspect water intrusion, inspect the gearcase and seals before continued operation.

Check for Metal in Gear Lube

Inspect drained gear lubricant and the magnetic drain plug, when equipped, during service. A small amount of fine metallic residue can occur during normal operation, but excessive metal particles or larger fragments can indicate a gearcase problem that should be investigated.

How to Choose Mercury Marine Engine Lube

Check Your Mercury Owner's Manual

Start with the lubricant specifications listed for your particular engine or drive. The correct Mercury gear lube or marine grease can vary by outboard family, horsepower, gearcase, sterndrive model, and application.

Use Your Engine Model & Serial Number

When you're unsure which Mercury lubricant or maintenance product you need, identify your engine model and serial number. This information can help distinguish between engines that may share a horsepower rating but have different maintenance requirements.

Mercury vs. Quicksilver Lubricants

Mercury Marine and Quicksilver offer marine engine lubricants and maintenance products for compatible Mercury engines and drives. Product labeling and packaging can vary, so compare the lubricant specification and intended application rather than selecting a product based only on brand appearance.

Changing Mercury Lower Unit Gear Lube

When Should You Change Mercury Gear Lube?

Follow the maintenance schedule for your specific Mercury outboard or MerCruiser drive. Gear lube is typically serviced based on operating hours, elapsed time, or both. Boats operated heavily, in saltwater, or under demanding conditions may require additional inspections.

Inspect the Old Gear Lube

As the old lubricant drains, inspect its condition. Look for unusual discoloration, a milky appearance, water, excessive metallic material, or other signs that could indicate internal wear or a sealing problem.

Use the Correct Filling Procedure

Many marine lower units are filled through the lower drain/fill opening until lubricant reaches the appropriate vent or level opening, but procedures vary by engine and drive. Follow Mercury's instructions for your specific gearcase and replace required seals or gaskets during service.

Frequently Asked Questions About Mercury Marine Engine Lube

What gear lube should I use in my Mercury outboard?

The correct gear lube depends on your Mercury outboard and gearcase. Mercury and Quicksilver offer Premium Gear Lube and High Performance Gear Lube for different compatible applications. Check your engine owner's manual or Mercury specifications before selecting a lubricant.

What is Mercury High Performance Gear Lube?

Mercury High Performance Gear Lube is a marine gear lubricant designed for compatible outboard lower units and sterndrives operating under demanding conditions. It is formulated to provide lubrication and protection for gears and bearings in specified Mercury and MerCruiser applications.

What is the difference between Mercury Premium and High Performance Gear Lube?

Mercury Premium and High Performance Gear Lubes are formulated for different compatible marine applications. Do not assume they are interchangeable. Use the gear lubricant specified for your exact Mercury engine or MerCruiser drive.

How often should I change the gear oil in my Mercury outboard?

Gear oil service intervals depend on the engine, hours of use, and operating conditions. Follow the Mercury maintenance schedule for your specific outboard and inspect the lubricant during service for signs of water intrusion or abnormal wear.

Why is my Mercury lower unit oil milky?

A milky or cloudy appearance can indicate that water has mixed with the gear lubricant. Possible causes include damaged seals, fishing line around the propeller shaft, or other sealing issues. A gearcase with suspected water intrusion should be inspected before continued use.

How much gear lube does a Mercury outboard need?

Gear lube capacity varies by Mercury engine and gearcase. Check the specifications for your exact engine model rather than estimating capacity based on horsepower alone.

Can I use automotive gear oil in my Mercury outboard?

Use the marine gear lubricant specified by Mercury for your particular engine or drive. Marine gearcases operate in conditions that differ from automotive applications, including constant exposure to water and moisture, so an automotive lubricant should not be substituted unless specifically approved for the application.

What is Mercury 2-4-C lubricant used for?

Mercury and Quicksilver 2-4-C is a multi-purpose marine lubricant used at compatible grease and lubrication points. Refer to your Mercury owner's or service manual to determine where 2-4-C is specified on your particular engine.

Should I replace the drain plug gasket when changing Mercury gear lube?

Follow Mercury's service instructions for your gearcase and replace specified drain or vent screw seals and gaskets during service. Proper sealing is important for helping prevent lubricant loss and water intrusion.

Can I change Mercury lower unit oil myself?

Many boat owners perform routine lower unit gear lube changes themselves using the correct lubricant, pump, tools, and replacement seals. Follow the service procedure for your exact Mercury engine or drive. If you find water, excessive metal, damaged threads, or other potential problems, professional inspection may be appropriate.

Shop Mercury Marine Engine Lube at West Marine

Shop Mercury Marine engine lube at West Marine for outboard and sterndrive maintenance. Find Mercury and Quicksilver High Performance Gear Lube, Premium Gear Lube, lower unit gear oil, 2-4-C marine lubricant, marine grease, gear lube pumps, seals, gaskets, and other lubrication and maintenance products. Whether you're servicing a Mercury FourStroke, Verado, Pro XS, or compatible MerCruiser drive, find the Mercury marine lubricants you need to protect your engine and keep your boat ready for the water.