Mercury Marine Gear Lube & Power Trim Fluid

Mercury Marine Gear Lube and Power Trim Fluid Resources and Information

PartsVu.com is happy to offer a wide selection of certified Mercury marine gear lube and power trim fluid to match the exact specifications of your Mercury outboard engine. If you need assistance servicing your Mercury outboard, follow along with these helpful guides over on our blog: Mercury fuel system 100-hour service, Guide to Mercury Marine Precision Oils and Lubricants.

Browse the rest of our complete selection of Mercury outboard parts, or shop our list of Mercury lubes, oils, and additives categories, including: 

• Mercury Precision Lubricants Engine Oil
• Mercury Marine Gear Lube & Power Trim Fluid
• Mercury Corrosion Inhibitors & Grease
• Mercury Marine Fuel Additives & Fogging Oils
• Quicksilver Marine Engine Oil
• Quicksilver Marine Fuel Additives & Fogging Oil

We also offer helpful resources to help you maintain your Mercury outboard motor, such as:

• Mercury Outboard Service Schedule
• Mercury Outboard Specs & Capacities Chart
• Mercury Outboard Serial Number Lookup

Mercury Marine Gear Lube and Power Trim Fluid 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 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 do I service my Mercury 4-stroke outboard engine?

Use a filter wrench to loosen the existing filter element and use caution when removing it as it will be filled with gasoline. A clear plastic or glass container is helpful to dump the filter and examine the contents. A small amount of debris is common, as is a small amount of water after the fuel has had a moment to settle. More significant amounts of water would warrant further investigation.

If your filter’s mounting location allows it, pre-fill the replacement filter with some gasoline to make re-priming the fuel system easier. It is also advisable to use a small amount of grease or engine oil to lubricate the o-ring before installation. Spin on and hand tighten only about a half turn to snug.

Move back to the engine and locate the filter element(s) on the engine. The scope of this service will only include the low-pressure fuel filter and fuel water separator if applicable by model. Mercury recommends that owners do not service their high-pressure fuel filters. Depending on your engine model, the water separator filter (or castle filter) may be removed by using a wrench, standard tools, and a little caution. Unplug the water-in-fuel sensor if applicable and spin the cap off of the housing. Replace the filter element with a fresh one, lube the o-ring with grease or oil, and carefully reinstall the cap.

For most other models, the low-pressure fuel filter is inline where the fuel supply line passes down the side of the cowling. On applicable models, locate the Schrader valve on the fuel system. Cover the valve with a rag or towel and depress the valve stem to vent the pressure from the system before service. With the pressure vented, remove the inline filter and replace it with a new one paying particular attention to locate the clamps or zip ties securing the hoses to the filter.

What Is Mercury Marine Power Trim & Steering Fluid?

Mercury Marine Power Trim & Steering Fluid is a hydraulic fluid that is specifically formulated for use in power trim and steering systems of Mercury outboard and sterndrive engines. It is designed to provide optimal performance and protection for the hydraulic system and components, such as the hydraulic pump, cylinders, and valves.

The fluid is specially blended to provide excellent resistance to oxidation and corrosion, as well as superior anti-wear and anti-foam properties, which help to ensure long-lasting performance and protect the hydraulic system from damage.

Mercury Marine Power Trim and Steering Fluid is recommended by Mercury Marine for use in all power trim and steering systems in their outboard and sterndrive engines. It is important to use the correct fluid specified by Mercury Marine for your specific application to ensure optimal performance and protection of your engine.

Are Mercury Marine power trim fluid and Mercury Marine power steering fluid the same thing?

No, Mercury Marine power trim fluid and Mercury Marine power steering fluid are not the same thing.

Mercury Marine power trim fluid is a hydraulic fluid that is specifically formulated for use in power trim and steering systems of Mercury outboard and sterndrive engines. It is designed to provide optimal performance and protection for the hydraulic system and components, such as the hydraulic pump, cylinders, and valves.

On the other hand, Mercury Marine power steering fluid is a hydraulic fluid that is specifically formulated for use in power steering systems of Mercury outboard and sterndrive engines. It is designed to provide optimal performance and protection for the power steering system and components, such as the hydraulic pump, steering cylinder, and hoses.

While both fluids are hydraulic fluids, they have different formulations and are designed for use in different systems and components. It is important to use the correct fluid specified by Mercury Marine for your specific application to ensure optimal performance and protection of your engine.

What's the shelf life for Mercury marine power trim fluid?

The shelf life of Mercury Marine Power Trim Fluid can vary depending on the storage conditions and the age of the product at the time of purchase. Mercury Marine recommends that their power trim fluid be used within two years from the date of manufacture for best performance and protection of your hydraulic system.

If you have an unopened container of Mercury Marine Power Trim Fluid and you are unsure of its age, you can check the date of manufacture on the container. The date is typically stamped on the container or printed on a label.

If the container has been opened and the fluid has been exposed to air or moisture, the shelf life may be reduced. In this case, it is recommended to check the fluid for signs of contamination or degradation before use. Signs of contamination or degradation may include discoloration, a strong odor, or the presence of sediment or particles in the fluid.

If you are unsure about the condition or age of your Mercury Marine Power Trim Fluid, it is recommended to replace it with fresh fluid to ensure optimal performance and protection of your hydraulic system.

What is the Mercury Marine Mercury premium power trim and steering fluid SDS?

The Safety Data Sheet (SDS) for Mercury Marine Mercury Premium Power Trim and Steering Fluid provides information on the composition, potential hazards, safe handling and use, and emergency measures in case of accidental exposure or spill.

Here are the basic details from the SDS for Mercury Marine Mercury Premium Power Trim and Steering Fluid:

Composition:

• The fluid is a mixture of refined mineral oil, performance additives, and a small amount of zinc dialkyldithiophosphate.

Potential hazards:

• The fluid is not classified as hazardous according to the Globally Harmonized System of Classification and Labeling of Chemicals (GHS).
• However, it may cause irritation to the eyes and skin upon contact.

Safe handling and use:

• Avoid prolonged or repeated skin contact with the fluid.
• Wear appropriate personal protective equipment, such as gloves and safety glasses.
• Keep the fluid away from heat, sparks, open flames, and other sources of ignition.
• Store the fluid in a cool, dry, and well-ventilated area, away from direct sunlight.

Emergency measures:

• In case of eye or skin contact, flush the affected area with plenty of water for at least 15 minutes.
• In case of ingestion, do not induce vomiting and seek medical attention immediately.
• In case of accidental spill or release, contain the spill and prevent the fluid from entering drains or waterways.
• For more information, refer to the SDS and follow the instructions for safe handling and use.

It is worth noting that Mercury Marine Quicksilver Power Trim and Steering Fluid SDS is the same product as Mercury Marine Mercury Premium Power Trim and Steering Fluid SDS - therefore, the SDS is essentially the same for both products.

Is trim fluid for boats carcinogenic?

Mercury Marine Power Trim & Steering Fluid, which is a popular trim fluid for boats, is not classified as carcinogenic or mutagenic based on available information.

According to the Safety Data Sheet (SDS) for Mercury Marine Power Trim & Steering Fluid, it is not classified as a carcinogen by any recognized agency or organization, such as the International Agency for Research on Cancer (IARC), the US National Toxicology Program (NTP), or the Occupational Safety and Health Administration (OSHA).

What tools and supplies do I need for Mercury power trim fluid replacement?

To perform a Mercury power trim fluid replacement, you will need the following tools and supplies:

1. Mercury Power Trim & Steering Fluid: This is the specific type of fluid recommended by Mercury Marine for use in their power trim and steering systems.
2. Drain pan: A container to catch the old fluid as it drains out.
3. Wrench or socket set: You will need a wrench or socket set to remove the drain plug from the trim and tilt system.
4. Funnel: A funnel will help you to pour the new fluid into the system without spilling it.
5. Clean rags or towels: These will come in handy to clean up any spills or drips.
6. Gloves and safety glasses: It is always a good idea to wear gloves and safety glasses when working with any type of fluid.
7. Optional: A hand pump or fluid transfer pump can be used to help refill the system with new fluid.

It is also recommended to refer to the owner's manual for your Mercury outboard or sterndrive engine for specific instructions and guidance on performing a power trim fluid replacement. Following the recommended procedures and using the recommended tools and supplies will help to ensure a safe and effective power trim fluid replacement.

Can I use MerCruiser power trim fluid in my Mercury outboard motor?

MerCruiser Power Trim Fluid and Mercury Power Trim & Steering Fluid are both hydraulic fluids designed for use in power trim and steering systems.

While they may have similar properties and be compatible with some components, it is important to use the recommended fluid for your specific engine. Using the wrong fluid can potentially cause damage to the system and compromise its performance.

Mercury Marine recommends using their Mercury Power Trim & Steering Fluid in Mercury outboard and sterndrive engines. If you are unsure about which fluid to use or have any questions, it is always best to consult your owner's manual or contact a certified Mercury Marine technician for guidance.

How to fill trim and tilt fluid? (Mercury outboards)

To fill the trim and tilt fluid on a Mercury outboard engine, follow these steps:

1. First, locate the trim and tilt reservoir. It is typically located on the transom of the boat near the motor.
2. Clean the area around the reservoir to prevent any dirt or debris from getting into the system when you add fluid.
3. Remove the cap from the reservoir and use a funnel to add the appropriate fluid. Check the owner's manual to make sure you are using the correct fluid type and amount.
4. Fill the reservoir to the full mark on the dipstick or sight glass.
5. Replace the cap on the reservoir and wipe away any spilled fluid.
6. Start the engine and operate the trim and tilt system to check for any leaks or unusual noises.
7. If the fluid level drops significantly after use, check for leaks in the system and add more fluid as needed.

It's important to note that proper maintenance and regular checks of the trim and tilt system can help prevent damage and ensure optimal performance of the Mercury outboard engine.

Can you mix hydraulic gear oil with other Mercury boat lubricants?

It is not recommended to mix hydraulic gesr oil with other Mercury boat lubricants as it may affect the performance of the hydraulic gear oil and could potentially damage the hydraulic system. It is best to use the specific type and brand of hydraulic gear oil recommended by the manufacturer for the specific application. Mixing different types or brands of lubricants could lead to reduced performance, increased wear and tear, and potentially expensive repairs.

Shop PartsVu for Gear Oil | Mercury Outboard Engines

Where can I learn more about Mercury outboard parts?

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 outboard engine maintenance.

To get you off to a good start, these are some of the most important articles on Mercury Marine Gear Lube & Power Trim Fluid, best-practices for gear case oil, how to change Mercury high performance gear lube, and more:

• Guide to Mercury Marine Precision Oils & Lubricants
• Mercury Lower Unit - 4-Stroke 100-Hour Service
• Mercury Grease Points - 4-Stroke 100-Hour Service
• How To Protect Your Mercury Outboard

What are the benefits of using OEM Mercury Marine Power Trim & Steering Fluid vs aftermarket brands like Quicksilver?

Overall, while aftermarket fluids may be less expensive, using OEM Mercury Marine Power Trim & Steering Fluid is recommended to ensure the best performance, protection, and warranty coverage for your Mercury Marine products.

Using OEM Mercury Marine Power Trim & Steering Fluid has several benefits over using aftermarket power trim fluid brands like Quicksilver:

1. Compatibility: OEM fluids are specifically designed and tested for use with Mercury Marine products, ensuring compatibility and optimal performance.
2. Quality: OEM fluids are manufactured to the highest standards and quality control measures, ensuring a consistent and reliable product.
3. Warranty: Using OEM fluids helps to ensure that your Mercury Marine products remain under warranty. In some cases, the use of aftermarket fluids can void warranties.
4. Performance: OEM fluids are formulated to meet the specific needs of Mercury Marine products, providing optimal performance and protection.
5. Convenience: OEM fluids can be easily found at Mercury dealerships and other authorized Mercury retailers, providing convenient access to the right products for your Mercury Marine products.

What are the main differences between Mercury gear lube sae 90 between quicksilver 80w 90 premium gear lube?

The main difference between Mercury Gear Lube SAE 90 and Quicksilver 80W-90 Premium Gear Lube is their viscosity ratings. Mercury Gear Lube SAE 90 has a single grade viscosity rating of 90, while Quicksilver 80W-90 has a multi-grade viscosity rating of 80W-90.

This means that Quicksilver 80W-90 is more versatile and can perform better in different temperatures and conditions. The "W" in the rating means that the gear lube has been tested and rated for use in colder temperatures, while the "90" rating ensures that it maintains its viscosity in high-temperature conditions.

In terms of their performance and protection, both gear lubes are designed to provide excellent wear protection, corrosion resistance, and longer gear life for marine applications. However, it is important to always use the gear lube recommended by the manufacturer to ensure the best performance and protection for your specific engine.

What is Mercury outdrive oil?

Mercury outdrive oil is a specialized lubricant designed for use in stern drives or outboard lower units of Mercury marine engines. This oil is formulated to provide excellent protection against wear and corrosion in harsh marine environments and to withstand the high loads and temperatures generated by the gears and bearings in the outdrive. Mercury outdrive oil comes in various grades and types, such as SAE 90, SAE 80W-90, and synthetic blends, and is recommended for use in Mercury and Mercruiser sterndrives and outboards.

Shop PartsVu OEM Mercury Marine Power Trim & Steering Fluid 32oz