Mercury Quicksilver Marine Gear Lube & Power Trim Fluid

Mercury Quicksilver Marine Gear Lube and Power Trim Fluid Resources and Information

PartsVu.com is happy to offer a wide selection of certified Mercury and Quicksilver 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 Quicksilver 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.

Do I need a Quicksilver gear lube pump to add and remove lubricant?

While it is possible to add and remove gear lube from your outboard engine without a gear lube pump, using a gear lube pump is generally recommended as it can make the process easier and more efficient.

A gear lube pump is designed to fit onto the gear lube bottle and provide a secure connection to the gearcase fill and drain ports. This allows for easy and precise application of the gear lube, without the risk of spills or leaks.

In addition, using a gear lube pump can help to ensure that the proper amount of gear lube is added or removed from the engine, which is important for maintaining optimal performance and avoiding potential damage to the gearcase.

Quicksilver offers a range of gear lube pumps that are specifically designed for use with their gear lube products. While it is not strictly necessary to use a Quicksilver gear lube pump, using a pump that is specifically designed for use with the product can help to ensure proper fit and function.

If you choose not to use a gear lube pump, it's important to be very careful when adding or removing gear lube to avoid spills or leaks, which can be harmful to the environment and potentially damaging to your engine.

Is Quicksilver Power Trim and Steering Fluid better than Mercury's own brand?

Quicksilver Power Trim and Steering Fluid is a high-quality hydraulic fluid that is designed for use in power trim and steering systems on boats. It is manufactured by Quicksilver, which is a subsidiary of Mercury Marine, a leading manufacturer of marine engines and accessories.

Both Quicksilver Power Trim and Steering Fluid and Mercury's own brand of hydraulic fluid are designed to meet the specific needs of marine hydraulic systems. While both products are of high quality and are suitable for use in these systems, it is difficult to say that one is definitively better than the other.

Ultimately, the choice between the two products may come down to personal preference or availability. It is important to always use the hydraulic fluid that is recommended by the manufacturer of your specific boat and engine to ensure proper operation and to avoid any potential damage or safety issues.

What is the Mercury Marine Quicksilver Power Trim and Steering Fluid SDS?

The Safety Data Sheet (SDS) for Mercury Marine Quicksilver Power Trim & Steering Fluid is a document that provides important safety and handling information for the product. It contains information on the product's composition, potential health hazards, first aid measures, firefighting measures, and handling and storage instructions.

Here is a general overview of the SDS for Mercury Marine Quicksilver Power Trim and Steering Fluid:

• Product Name: Mercury Marine Quicksilver Power Trim and Steering Fluid
• Manufacturer: Quicksilver, a division of Mercury Marine
• Product Description: Hydraulic fluid for power trim and steering systems on boats
• Composition: The product contains a proprietary blend of mineral oil, additives, and other components.
• Potential Health Hazards: The product is classified as not hazardous under the OSHA Hazard Communication Standard. However, prolonged or repeated exposure to the product may cause skin irritation, eye irritation, or respiratory irritation.
• First Aid Measures: The SDS provides instructions on how to treat individuals who have been exposed to the product, including recommendations for seeking medical attention if necessary.
• Firefighting Measures: The SDS provides instructions on how to extinguish fires that involve the product, including recommendations for using appropriate fire extinguishing agents and protective equipment.
• Handling and Storage: The SDS provides recommendations for safe handling and storage of the product, including instructions for avoiding spills and leaks, using appropriate personal protective equipment, and storing the product in a cool, dry, well-ventilated area.

It's important to review and follow the instructions provided in the SDS for any product you use to ensure safe handling and use.

How often should I replace my Quicksilver Gear Lube?

The recommended frequency for replacing Quick Silver Gear Lube can vary depending on the specific use and conditions of your boat's gearcase.

As a general guideline, Quicksilver recommends that the gear lube be changed every 100 hours of operation or once per year, whichever comes first. However, if your boat is used in extreme conditions such as heavy loads, high speeds, or frequent use, you may need to change the gear lube more frequently.

In addition to regular intervals, it's also important to check the gear lube periodically for signs of water intrusion or contamination. If you notice water or other debris in the gear lube, it's important to replace it immediately to prevent damage to the gearcase.

It's always a good idea to consult your boat's owner's manual or the manufacturer's recommendations for the specific intervals and procedures for changing the gear lube on your boat. Following the manufacturer's recommended maintenance schedule can help to ensure proper operation and prolong the life of your boat's gearcase.

Are there companies that analyze lube for my outboard?

Yes, there are companies that specialize in analyzing the condition of lubricants, including gearlube for outboard engines. These companies use specialized equipment and techniques to examine the lubricant for signs of wear, contamination, and other issues that could affect the performance and longevity of the engine.

Some companies that offer lubricant analysis services for outboard engines include Oil Analyzers Inc., Blackstone Laboratories, and Polaris Laboratories. These companies typically provide customers with a testing kit that includes instructions for taking a representative sample of the lubricant and sending it to the laboratory for analysis.

The laboratory will then analyze the sample and provide a detailed report that includes information on the condition of the lubricant, any signs of wear or contamination, and recommendations for maintenance and further testing if necessary.

Lubricant analysis can be a valuable tool for detecting potential issues early, allowing for timely maintenance and repair to prevent more serious and costly damage. It's always a good idea to consult your boat's owner's manual or the manufacturer's recommendations for the specific intervals and procedures for lubricant analysis and maintenance for your outboard engine.

What are the most common problems for my Mercury outboard electric power steering systems?

Electric power steering systems in Mercury outboard engines are generally reliable and require minimal maintenance. However, like any mechanical system, they can experience issues from time to time. Here are some of the most common problems that may occur with Mercury outboard electric power steering systems:

1. Low power or intermittent power: This can be caused by a number of factors, including a low battery, a faulty power steering module, a bad motor, or a problem with the wiring or connections.
2. Steering wheel not responding: If the steering wheel does not respond or feels stiff or heavy, it may be due to a faulty power steering module, a malfunctioning motor, or a problem with the wiring or connections.
3. Unusual noises: Strange noises coming from the power steering system, such as grinding, whining, or clunking, can be an indication of a problem with the motor or the power steering module.
4. Warning lights or messages: If the engine's warning lights or messages are indicating a problem with the power steering system, it may be due to a fault in the power steering module or a problem with the wiring or connections.
5. Overheating: Overheating can occur if the power steering motor is working too hard or if there is a blockage in the system. This can be caused by a variety of factors, including a low battery, a faulty power steering module, or a malfunctioning motor.

If you experience any of these problems with your Mercury outboard electric power steering system, it's important to have it checked by a qualified technician to determine the cause of the issue and make any necessary repairs. Regular maintenance and inspections can help to prevent problems from occurring and ensure that your power steering system is functioning properly.

Should I use Evinrude gear oil in my Mercury outboard?

It's generally recommended to use the manufacturer's recommended gear oil in your Mercury outboard engine. While Evinrude gear oil may be suitable for use in some outboard engines, it's always best to use the gear oil that is specifically recommended by the manufacturer.

Mercury offers a range of gear oils that are designed to meet the specific needs of their outboard engines. These gear oils are formulated to provide optimal protection and performance for the engine's gearcase, and using them can help to ensure that your outboard is functioning properly and lasts for many years.

Using a gear oil that is not recommended by the manufacturer could potentially cause damage to the engine or compromise its performance. If you're not sure which gear oil to use in your Mercury outboard engine, consult the owner's manual or contact a qualified technician for advice.

Can I use Quicksilver high performance gear lube as a substitute for Honda outboard gear oil?

It is generally not recommended to use a substitute gear oil that is not specifically recommended by the manufacturer of your outboard motor, in this case, Honda.

While Quicksilver high performance gear lube is a high-quality lubricant that may provide excellent performance in a wide range of marine applications, it may not be suitable for use in all types of outboard motors, including Honda outboard motors. Honda may have specific requirements for the type of gear oil that should be used in their outboard motors, including viscosity ratings and additive specifications.

Using a substitute gear oil that is not recommended by the manufacturer could potentially lead to reduced performance, premature wear, or even damage to the outboard motor. It is always best to consult the owner's manual or contact the manufacturer to determine the specific gear oil requirements for your Honda outboard motor and use the recommended gear oil for optimal performance and protection.

How is 80w-90 gear oil  different than 85w-90 gear oil?

The difference between 80w-90 gear oil and 85w-90 gear oil lies in their low-temperature viscosity ratings. The "w" in both terms stands for "winter," and the number that precedes it indicates the gear oil's viscosity rating at low temperatures.

Specifically, 80w-90 gear oil has a viscosity rating of 80 at 0 degrees Fahrenheit (-18 degrees Celsius), while 85w-90 gear oil has a viscosity rating of 85 at 0 degrees Fahrenheit. This means that 85w-90 gear oil is slightly thicker than 80w-90 gear oil at low temperatures.

However, at high temperatures, both 80w-90 and 85w-90 gear oils have the same viscosity rating of 90, according to the SAE J306 viscosity classification system. This means that both gear oils provide similar levels of protection and lubrication under high-temperature, high-load conditions.

In general, the choice between 80w-90 and 85w-90 gear oil depends on the specific application and the manufacturer's recommendations. In some cases, the equipment may require a specific viscosity grade, while in others, the choice may be based on the operating conditions and climate.

What do the numbers mean for Quicksilver 80w-90 premium gear lube?

The numbers in Quicksilver 80w-90 premium gear lube refer to the viscosity grade and performance level of the gear lube.

In the case of Quicksilver 80w-90, the "80w" indicates the gear lube's viscosity rating at low temperatures. The "w" stands for "winter," and the number before it (in this case, 80) represents the gear lube's viscosity rating according to the SAE J306 viscosity classification system at low temperatures. Specifically, it means that the gear lube has a viscosity rating of 80 at 0 degrees Fahrenheit (-18 degrees Celsius), which makes it suitable for use in colder climates.

The "90" in Quicksilver 80w-90 premium gear lube refers to the gear lube's viscosity rating at high temperatures. Specifically, it means that the gear lube has a viscosity rating of 90 at 100 degrees Celsius, according to the SAE J306 viscosity classification system. This rating indicates that the gear lube is suitable for use in high-temperature environments and under heavy loads.

Overall, Quicksilver 80w-90 gear lube is designed to provide excellent protection and performance for gears and bearings in a wide range of marine applications, including outboard and inboard/outboard (I/O) engines.

Where can I learn more about Quicksilver Marine Gear Lube & Power Trim Fluid?

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 Quicksilver power steering and trim fluid maintenance.

To get you off to a good start, these are some of the most important articles on how to lube gear components on your engine, when to change your Quicksilver power trim & steering fluid, and more:

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

What does the "SAE" mean in gear lube SAE 90 (such as Quicksilver 80w 90 premium gear lube)?

In the term "gear lube SAE 90," "SAE" stands for the Society of Automotive Engineers. The SAE is an organization that sets industry standards for various aspects of engineering, including lubricants and lubricant viscosity ratings.

In the case of gear lubricants, the SAE has established a set of viscosity grades that describe the lubricant's resistance to flow at different temperatures. The "SAE 90" designation indicates that the gear lubricant has a viscosity rating of 90 at 100 degrees Celsius, which is the temperature at which gear lubricants are typically rated.

This viscosity rating is important because it helps ensure that the gear lubricant will provide proper lubrication and protection for gears operating at high temperatures and under heavy loads.

What is outdrive oil?

Outdrive oil is a specialized lubricant that is used to protect and lubricate the gears and bearings in the outdrive of a boat or watercraft. An outdrive is a propulsion system that is typically used in boats with inboard/outboard (I/O) engines.

The outdrive is the lower unit of the I/O engine that sits below the boat's hull and is responsible for transferring power from the engine to the propeller, which propels the boat through the water. The outdrive is also responsible for steering the boat and controlling its direction.

Outdrive oil is specially formulated to withstand the harsh marine environment, which can include exposure to saltwater, high temperat