Mercury Outboard Gear Lube Kits

Mercury Marine Engine Gear Lube Kits Resources and Information

PartsVu’s outboard gear lube kits contain everything you need to service your Mercury outboard motor. The certified Mercury outboard oil, gaskets, and oil pumps included in these kits apply to a selection of common Mercury outboard models, including Twin Engine, Verado, Alpha Gen II, Bravo, and Alpha One Gen II. 

We also offer helpful resources to help you find the right Mercury outboard parts and maintain your outboard motor, such as:

• Mercury Outboard Maintenance Parts Charts
• Mercury Outboard Service Schedule
• Mercury Outboard 100-hour Service Guides

Mercury Outboard Gear Lube Kits FAQs

How do I service my Mercury 4-stroke outboard lower unit? 

Use an appropriately sized screwdriver assisted by a wrench if necessary to loosen these screws which should be pretty tight. An impact driver and hammer might be needed. If the drain screw has a magnetic tip, inspect the plug after removal to see if heavy deposits exist. Some fine shavings are normal, but chunks or a large quantity of metal is cause for further inspection. Have a drain pan ready, and extra rags handy as gear lube will begin running down the skeg as soon as you remove the upper vent plug. Be sure to collect the used gaskets from both plugs after removal as these are not reusable and should be discarded.

Allow several minutes with the engine tilted all the way down to drain all the old gear oil fully. Like your engine oil, inspect the spent oil for evidence of water intrusion, other contamination, or metal. If you have purchased one of PartsVu’s handy lower unit oil change kits, you will already have new gaskets, oil, and a pump. Screw the pump into the lower drain hole, then connect it to the container of gear oil.

Begin pumping oil into the Mercury lower unit until oil begins to flow from the vent plug at the top. Stop pumping and wait a few minutes for all the air bubbles to work themselves out of the gearcase. After this brief pause, pump a few more times until clean gear oil without bubbles is flowing from the vent plug. With a fresh gasket in place, install and torque the top vent plug. Unscrew your fill hose from the lower drain plug and quickly swap in the lower drain plug with a new gasket — torque to spec.

Before you do get started on any maintenance projects, make sure to get the right parts (even for Mercruiser engines) so you don’t have to stop right in the middle.

How do I service my Mercury 2-stroke outboard lower unit? 

Use an appropriately sized screwdriver assisted by a wrench if necessary to loosen these screws which should be pretty tight. An impact driver and hammer might be needed. If the drain screw has a magnetic tip, inspect the plug after removal to see if heavy deposits exist. Some fine shavings are normal, but chunks or a large quantity of metal is cause for further inspection. Have a drain pan ready, and extra rags handy as gear lube will begin running down the skeg as soon as you remove the upper vent plug. Be sure to collect the used gaskets from both plugs after removal as these are not reusable and should be discarded.

Allow several minutes with the engine tilted all the way down to drain all the old gear oil fully. Like your engine oil, inspect the spent oil for evidence of water intrusion, other contamination, or metal. If you have purchased one of PartsVu’s handy lower unit oil change kits, you will already have new gaskets, oil, and a pump. Screw the pump into the lower drain hole, then connect it to the container of gear oil.

Begin pumping oil into the Mercury 2-stroke lower unit until oil begins to flow from the vent plug at the top. Stop pumping and wait a few minutes for all the air bubbles to work themselves out of the gearcase. After this brief pause, pump a few more times until clean gear oil without bubbles is flowing from the vent plug. With a fresh gasket in place, install and torque the top vent plug. Unscrew your fill hose from the lower drain plug and quickly swap in the lower drain plug with a new gasket — torque to spec.

How do I service my Mercury 2-stroke outboard motor grease points?

Note that fittings can be contaminated by salt – especially the ones near the steering tube – so replace them if they are too corroded to accept grease. Watch as you pump fresh grease into the fitting and see if old, dirty grease or water or both push out from the corresponding space. Ideally, these cavities are filled with clean grease all the time. A light coating of grease on the tip of the trim rams will reduce friction there as well. If your engine is equipped with stainless balls on the tips of the trim rams, work the balls to get the grease inside their cup.

If your prop was not removed for the gear lube change, remove the cotter pin or lock washer from the propeller and loosen the prop nut. Exercise extreme caution as prop blades can be very sharp. With the nut loosened, remove the propeller and associated prop hardware to inspect the propeller shaft.

Look for fishing line that may be behind the prop and near the prop shaft oil seals. Remove any line and if the seals are intact, apply a fresh coating of Mercury 2-4-C grease to the propeller shaft before reinstalling the prop. Tighten and use a new cotter pin to complete the installation if applicable.

Be aware that your boat’s propeller functions like your vehicle’s tires. Wear on the edges of the propeller can reduce traction, causing speed and fuel efficiency loss. Propeller reconditioning or replacement should be considered if you note wear, rounded edges, thin blades, or cracking. You should also inspect, and replace as needed, the hub inside the propeller. Cracking or wobbling can indicate a worn or damaged hub.

This is also a great time to inspect your external engine anodes. Anodes worn beyond 50 percent should be replaced. Be sure to select the correct sacrificial alloy. The proper sacrificial alloy will depend on whether you boat in salt or freshwater. Spend an extra couple of minutes to check fitment because different propeller selections will not work with all anodes.

On the powerhead itself, corrosion inhibitor can be liberally applied to the metal surfaces, taking some care to avoid the air intake itself. We recommend Boeshield’s T-9 brand, but any high-quality marine corrosion inhibitor will help. If any salt residue exists on the engine, rinse with a light stream of fresh water before applying T-9. This product also works well on battery connections, fuel/water separator bases, and trailer parts.

How do I check the hours on my Mercury outboard motor?

To access a Mercury outboard’s computer memory, you will need to visit an authorized Mercury outboard dealer. The dealer will have the necessary computer software and the cable to plug the shop’s laptop into your outboard.

A dealer might charge you for 30 minutes or so of labor to run a diagnostic scan, but if you are buying a used Mercury outboard motor, this investment is well worth it. However, if you are negotiating to buy the motor from a dealer, the dealer should be glad to give you a diagnostics report for no charge.

To access a Mercury outboard’s computer memory, you will need to visit an authorized Mercury outboard dealer. The dealer will have the necessary computer software and the cable to plug the shop’s laptop into your outboard.

A dealer might charge you for 30 minutes or so of labor to run a diagnostic scan, but if you are buying a used Mercury outboard, this investment is well worth it. However, if you are negotiating to buy the motor from a dealer, the dealer should be glad to give you a diagnostics report for no charge.

How often do you change gear lube on a Mercury outboard?

Mercury Marine recommends changing the gear lube in your Mercury outboard every 100 hours of operation or once a year, whichever comes first. However, if you use your boat in dirty or sandy conditions, or if you frequently operate at high speeds, you may need to change the gear lube more often.

Is Mercury Racing Gear Lube the same as high performance gear lube?

Mercury Racing Gear Lube is specifically designed for high-performance applications, such as racing or high-speed boating. While it is similar to other high-performance gear lubes, it is formulated to provide superior protection against extreme pressures, heat, and wear. It is not the same as standard high-performance gear lubes, and is not recommended for use in regular recreational boating.

What gear oil to use in a Mercury outboard?

Mercury Marine recommends using their own brand of gear oil, called Quicksilver High Performance Gear Lube, in their outboard engines. However, there are other brands of high-quality marine gear oils that are also suitable for use in Mercury outboards. Be sure to check the specifications for your engine and use a gear oil that meets or exceeds those requirements.

Is there a difference between marine gear oil and regular gear oil?

Yes, there is a difference between marine gear oil and regular gear oil. Marine gear oils are specifically formulated to withstand the harsh marine environment, which includes exposure to saltwater, moisture, and extreme temperatures. They are designed to provide superior protection against rust and corrosion, and to maintain their performance even under heavy loads and high speeds. Regular gear oils are not designed to withstand these conditions and may not provide adequate protection for marine applications. It's important to use a gear oil that is specifically formulated for marine use in your Mercury outboard.

How to change oil in inboard boat motor?

Changing the oil in an inboard boat motor is an important maintenance task that should be done regularly to ensure the engine runs smoothly and efficiently. Here are the steps to change the oil in an inboard boat motor:

1. Warm up the engine: Start the engine and let it run for a few minutes to warm up the oil. Warm oil flows better, making it easier to drain from the engine.
2. Turn off the engine: Turn off the engine and allow it to cool down for a few minutes. Oil can be very hot, and you don't want to burn yourself while draining it.
3. Locate the oil drain plug: Find the oil drain plug, which is usually located on the bottom of the engine. Refer to your owner's manual if you are unsure of its location.
4. Position the oil pan: Place an oil pan or bucket under the oil drain plug to catch the used oil as it drains from the engine.
5. Remove the oil drain plug: Use a wrench to remove the oil drain plug and let the used oil flow into the oil pan.
6. Replace the oil filter: While the oil is draining, remove the old oil filter and replace it with a new one.
7. Install the drain plug: Once all the used oil has drained from the engine, install the oil drain plug and tighten it with a wrench.
8. Fill the engine with new oil: Locate the oil fill cap and remove it. Fill the engine with the recommended amount of fresh oil using a funnel. Check the oil level using the dipstick and add more oil if needed.
9. Check for leaks: Run the engine for a few minutes and check for leaks around the oil filter and drain plug. If you see any leaks, turn off the engine and tighten the affected area.
10. Properly dispose of used oil: Used oil is considered hazardous waste and should be disposed of properly. Bring the used oil to a recycling center or auto parts store that accepts used oil for recycling.

It's important to follow the recommended oil change interval for your particular engine, as specified in the owner's manual. Regular oil changes can help prolong the life of your engine and prevent costly repairs down the road.

What is Mercury lower unit oil made of?

Mercury outboard lower unit oil is typically made of a high-quality mineral or synthetic oil base, combined with advanced additives that provide enhanced protection against wear, corrosion, and foaming. The specific formulation may vary depending on the type and age of the lower unit, as well as the operating conditions it will be subjected to. Mercury Marine recommends using only their own branded lower unit oils, such as the Quicksilver High-Performance Gear Lube or the Mercury Premium Plus 2-Cycle TC-W3 Outboard Oil, to ensure optimal performance and longevity. It is important to follow the manufacturer's recommended oil specifications and change intervals for the specific lower unit model to maintain proper function and prevent damage.

Which oil change accessories help save time when it comes to changing a Mercury outboard engine oil?

There are several oil change accessories that can help save time and make the process of changing a Mercury outboard engine oil more efficient. Some of these accessories include:

1. Oil Drain Kit: This is a simple and easy-to-install device that makes oil changes faster and cleaner. It replaces the standard oil drain plug with a threaded hose fitting, allowing the oil to be drained directly into a container without the need for messy funnels or spillage.
2. Oil Extractor Pump: This is a hand-operated pump that can extract oil directly from the engine block or through the dipstick tube. It eliminates the need to crawl under the engine or remove drain plugs, and can also be used for other fluid extraction tasks.
3. Oil Filter Wrench: This is a specially designed wrench that makes removing and installing oil filters quick and easy. It provides a secure grip on the filter, reducing the risk of damage or spillage.
4. Oil Filter Drain Tool: This is a small plastic tool that fits over the oil filter and directs oil flow during removal, preventing oil from running down the engine block and making a mess.

Using these accessories can help streamline the oil change process, reduce mess and cleanup time, and minimize the risk of damage to the engine or surrounding components.

What are the supplies needed for oil change maintenance?

To perform an oil change, you typically need the following supplies:

1. Engine oil: This is the most important component of an oil change. You should choose an oil that meets the manufacturer's specifications for your particular engine.
2. Oil filter: The oil filter removes contaminants from the oil as it circulates through the engine. Make sure you select the correct filter for your engine.
3. Drain pan: You will need a pan to collect the old oil as it drains out of the engine.
4. Funnel: This will help you pour the new oil into the engine without spilling.
5. Wrench or socket set: You will need to remove the drain plug and oil filter with a wrench or socket set.
6. Gloves: It's a good idea to wear gloves to keep your hands clean and protect your skin from hot oil.
7. Rags or paper towels: You will need to clean up any spills or drips that occur during the oil change.
8. Oil filter wrench (optional): If your oil filter is difficult to reach, you may need an oil filter wrench to remove it.

Where can I learn more about Mercury Outboard Marine Gear Lube and outboard maintenance in general?

PartsVu understands that boaters want to learn how to perform their own Mercury outboard maintenance. From maintaining your Mercury outboard, Mercury sterndrive, and MerCruiser engines, there’s always something new to learn and save money. That’s why PartsVu offers our comprehensive blog, The Partsvu Xchange. 

Read up on the latest developments in boating, as well as search for everything you need to know about Mercury engine maintenance.

To get you off to a good start, these are some of the most important articles on how to change oil on inboard boat motor, how to change oil in a boat, and more:

• 5 Reasons To Get a Yamaha Marine Gear Lube Kit
• Mercury 2-Stroke Lower Unit - 100-Hour Service
• Guide to Mercury Marine Precision Oils & Lubricants
• How to Select the Right Mercury Outboard Parts

What is a Mercury outboard lower unit rebuild kit and when should I use it?

A Mercury outboard lower unit rebuild kit is a collection of parts designed to repair or replace worn or damaged components in the lower unit of your outboard engine. This kit typically includes seals, gaskets, bearings, and other essential parts. You should use a rebuild kit when you notice problems with your lower unit, such as leaks, excessive noise, or reduced performance.

What is a Mercury outboard lower unit seal kit and when should I use it?

A Mercury outboard lower unit seal kit is a collection of seals designed to prevent leaks in the lower unit of your outboard engine. This kit typically includes O-rings, oil seals, and other components that help to seal the lower unit. You should use a seal kit when you notice oil or other fluids leaking from your lower unit.

How do I choose the right lower unit seal kit for my Mercury outboard?

To choose the right lower unit seal kit for your Mercury outboard, you should consult your engine's owner's manual or a qualified mechanic. These resources will help you determine the correct part numbers and specifications for your engine's lower unit.

What type of oil should I use for my Mercury outboard's lower unit?

For the lower unit of your Mercury outboard engine, you should use a high-quality gear oil that meets the manufacturer's specifications. Consult your engine's owner's manual or a qualified mechanic for recommendations on the best oil to use for your engine.

What is a Mercury Verado oil change kit and how do I use it?

A Mercury Verado oil change kit is a collection of parts and supplies designed to help you perform an oil change on your Verado outboard engine. This kit typically includes oil, filters, and other essential components. To use the kit, consult your engine's owner's manual or a qualified mechanic for instructions on how to perform an oil change on your specific engine model.

What are the most popular late model lower unit seal kits sold by PartsVu?

PartsVu stocks a complete Mercury Marine gear lube catalog for all maintenance kits designed for late-model engines. The following are out most popular kits to choose from:

• 1973 Mercury 850 outboard lower unit seal kit
• 1973 Mercury outboard lower unit seal kit
• 1983 70 hp Mercury outboard lower unit seal kit
• 1985 Mercury 20 hp outboard lower unit seal kit
• 1989 Mercury outboard lower unit seal kit

How long will a marine oil change system last reliably?

Marine oil change systems can last for many years if they are properly maintained and used correctly. The lifespan of an oil change system will depend on several factors, such as the quality of the components, the frequency of use, and the level of maintenance.

High-quality oil change systems made by reputable manufacturers should last for many years. However, if the system is poorly constructed or made with cheap materials, it may not last as long and may require more frequent repairs or replacements.

Regular maintenance is important to ensure the longevity of the oil change system. This includes proper cleaning, lubrication of moving parts, and regular inspection for wear and tear. It is also important to follow the manufacturer's instructions for use and to avoid overuse or misuse of the system.

Where can I find a marine oil change service near me?

If you are in need of an oil change for your Mercury outboard engine, it's important to find a reliable marine oil change service near you. One option is to search online for "marine oil change near me" or "boat oil change near me" to see what options are available in your area. You can also check with local marinas, boat repair shops, and boating supply stores to see if they offer oil change services or can recommend a trusted service provider.

Another option is to use a mobile oil change service that will come to you and perform the oil change on site. These services can be a convenient option for boat owners who don't want to haul their boat to a service location. To find a mobile oil change service, search online for "precision oil change near me" or "oil change kit near me" to see what options are available in your area.

When choosing a marine oil change service, be sure to ask about the specific products they use and make sure they are using high-quality oils and filters that are recommended by Mercury for your particular engine. It's also important to inquire about their experience working with outboard engines and their certifications and qualifications. By doing your research and finding a reputable marine oil change service, you can help ensure that your Mercury outboard engine is properly maintained and running smoothly for years to come.

What do I need for an oil change on my Mercury outboard engine?

If you're due for an oil change on your Mercury outboard engine, there are a few essential items you'll need to complete the job. First and foremost, you'll need the appropriate motor oil change kit for your engine. This may include an oil filter and gasket, drain plug, and oil pan, depending on your engine's model and year. A comprehensive oil change bundle or kit may also include other parts needed for the job, such as fuel filters or drain hoses.

In addition to the oil change kit, you'll need a few other supplies to successfully change the oil in your boat engine. You'll want to have some type of oil change box or pan to catch the used oil and prevent spills. Depending on your setup, you may also need a pump or hose to extract the used oil from your engine and dispose of it properly. Other oil change items you may need include rags or shop towels for cleanup and a wrench or pliers to remove and install the oil filter.

If you're looking for a convenient, all-in-one solution for your oil change needs, consider purchasing an oil change kit or bundle specifically designed for your Mercury outboard engine. These kits typically come with everything you need to complete the job, making the process quick and easy. With the right oil change products and supplies, you can keep your engine running smoothly and avoid costly repairs down the road.