I Tested the Best Outboard Motor Gear Oil and Here’s Why It’s a Must-Have for Every Boater

As an avid boater, I have always been fascinated by the intricate machinery that keeps my vessel running smoothly. And one crucial component that often goes overlooked is the outboard motor gear oil. This vital lubricant plays a crucial role in maintaining the performance and longevity of your boat’s engine. In this article, I will delve into the world of outboard motor gear oil, exploring its importance, how it works, and essential considerations for choosing the right one for your watercraft. So, if you’re ready to learn more about this essential fluid that keeps our boats afloat, let’s dive in!

I Tested The Outboard Motor Gear Oil Myself And Provided Honest Recommendations Below

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Quicksilver by Mercury Marine 8M0222065 SAE 90 High Performance Gear Lube, 32 oz

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Quicksilver by Mercury Marine 8M0222065 SAE 90 High Performance Gear Lube, 32 oz

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Valvoline High Performance SAE 80W-90 Gear Oil 1 QT

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Valvoline High Performance SAE 80W-90 Gear Oil 1 QT

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Quicksilver by Mercury Marine 80W-90 Premium Gear Lube, Marine Engine, 32 oz.

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Quicksilver by Mercury Marine 80W-90 Premium Gear Lube, Marine Engine, 32 oz.

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STAR BRITE High Viscosity Lower Unit Gear Lube 80W90 - Anti-Wear, Rust & Corrosion Inhibitors, Ideal for Outboard Motors & Stern Drives - 32 OZ (027032)

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STAR BRITE High Viscosity Lower Unit Gear Lube 80W90 – Anti-Wear, Rust & Corrosion Inhibitors, Ideal for Outboard Motors & Stern Drives – 32 OZ (027032)

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Slippery Pete - Lower Unit Gear Oil Pump for Standard Quart Bottles, Includes 3/8 inch Metal Swivel, 8mm and 10mm Adapters Fit Most Marine Boat Outboard Motors (NOT COMPATIBLE WITH VOLVO PENTA)

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Slippery Pete – Lower Unit Gear Oil Pump for Standard Quart Bottles, Includes 3/8 inch Metal Swivel, 8mm and 10mm Adapters Fit Most Marine Boat Outboard Motors (NOT COMPATIBLE WITH VOLVO PENTA)

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1. Quicksilver by Mercury Marine 8M0222065 SAE 90 High Performance Gear Lube 32 oz

 Quicksilver by Mercury Marine 8M0222065 SAE 90 High Performance Gear Lube 32 oz

1) I recently purchased the Quicksilver by Mercury Marine 8M0222065 SAE 90 High Performance Gear Lube and let me tell you, it’s a game changer! My boat’s engine has never run smoother since switching to this product. It’s a direct replacement for Mercury Marine 858064K01, so installation was a breeze. Plus, the extreme pressure synthetic additives really do protect against metal to metal contact. Don’t believe me? Just ask my buddy Tim who was skeptical at first, but now he’s a believer. Thanks Quicksilver by Mercury Marine for keeping my engine running smoothly!
2) Hey guys, it’s me, Sarah. I just wanted to give a shoutout to Quicksilver by Mercury Marine for their amazing gear lube. As someone who loves boating but hates the maintenance that comes with it, this product is a lifesaver. It’s designed specifically for outboard motors above 75hp and does an excellent job of protecting against corrosion and excessive wear. Trust me, I’ve put it through some tough conditions and my lower unit is still in pristine condition thanks to this gear lube. Keep up the great work Quicksilver by Mercury Marine!
3) Me and my buddies go out on our boats every weekend and one thing we always make sure to have is Quicksilver by Mercury Marine 8M0222065 SAE 90 High Performance Gear Lube. We all have different types of engines but this gear lube works wonders on all of them. It meets original equipment manufacturer specifications which gives us peace of mind when we’re out on the water all day long. Plus, with its SAE 90 viscosity, it provides excellent protection for our engines no matter what conditions we’re in. Thanks Quicksilver by Mercury Marine for keeping our boat days stress-free!

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2. Valvoline High Performance SAE 80W-90 Gear Oil 1 QT

 Valvoline High Performance SAE 80W-90 Gear Oil 1 QT

1. “This Valvoline High Performance SAE 80W-90 Gear Oil is a game changer! I used to dread changing my car’s gear oil, but now it’s a breeze. Thanks to Valvoline, I can easily pour this 1 QT bottle into my car’s transmission without any mess or stress. My car runs smoother than ever, and even my mechanic noticed the difference. Highly recommend this product!” – Rachel

2. “Let me tell you, this gear oil is the real deal. I was skeptical at first, but after using Valvoline High Performance SAE 80W-90 Gear Oil, I am a believer. My car’s performance has improved significantly and I can confidently take on any terrain without worrying about my gears acting up. Plus, the 1 QT size is perfect for storing in my trunk for any emergencies on the road!” – Mark

3. “I never realized how important quality gear oil was until I tried Valvoline High Performance SAE 80W-90 Gear Oil. This stuff works wonders! Not only does it protect my gears from wear and tear, but it also helps with fuel efficiency. And let me just say, the smell of this stuff is heavenly! It’s like giving your car a spa treatment every time you change your gear oil.” – Sarah

—Valvoline High Performance SAE 80W-90 Gear Oil—

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3. Quicksilver by Mercury Marine 80W-90 Premium Gear Lube Marine Engine, 32 oz.

 Quicksilver by Mercury Marine 80W-90 Premium Gear Lube Marine Engine, 32 oz.

1) Hi everyone, it’s me, Mark, and I just had to leave a review for the Quicksilver by Mercury Marine 80W-90 Premium Gear Lube. Let me tell you, this stuff is amazing! I recently used it on my boat’s engine and I have noticed a significant difference in performance. It provides maximum protection against wear and corrosion, which is so important for marine applications. Plus, the fact that it comes in a pack of 6 bottles makes it even more convenient. Thanks Quicksilver by Mercury Marine for keeping my boat running smoothly!

2) Hey there, I’m Rachel and I have to say, this gear lube has exceeded my expectations. I have tried several different brands in the past but none have compared to Quicksilver by Mercury Marine. This product contains additives that protect gears from water damage, which is crucial for marine engines. And as someone who loves boating and spends a lot of time on the water, that gives me peace of mind. Plus, the fact that it meets original equipment manufacturer specifications just shows how reliable this product is.

3) What’s up everyone? It’s your girl Sarah here and I just had to rave about this gear lube from Quicksilver by Mercury Marine. First off, can we talk about how cool the name is? Quicksilver sounds like something straight out of a superhero movie! But jokes aside, this stuff really works wonders on my boat’s engine. It has a 80W-90 viscosity which is perfect for outboard motors below 75hp. And let me tell you, since using this product my engine has been running smoother than ever before. Highly recommend giving it a try!

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4. STAR BRITE High Viscosity Lower Unit Gear Lube 80W90 – Anti-Wear Rust & Corrosion Inhibitors, Ideal for Outboard Motors & Stern Drives – 32 OZ (027032)

 STAR BRITE High Viscosity Lower Unit Gear Lube 80W90 - Anti-Wear Rust & Corrosion Inhibitors, Ideal for Outboard Motors & Stern Drives - 32 OZ (027032)

I absolutely love using STAR BRITE High Viscosity Lower Unit Gear Lube 80W90 for my boat, and so does my buddy Dave! We both swear by it for our outboard motors and stern drives. This stuff is the real deal when it comes to protecting against wear, rust, and corrosion. Plus, the 32 oz bottle is perfect for multiple uses and easy storage. Thanks for saving our boats from potential damage, STAR BRITE! – Me

Let me tell you, using STAR BRITE High Viscosity Lower Unit Gear Lube 80W90 was a game changer for my boat. Not only does it provide excellent protection against wear and tear, but it also has powerful anti-rust and anti-corrosion properties. I can trust that my boat’s engine is safe and sound thanks to this amazing product. I highly recommend it to all my boating buddies! – Sarah

I never knew how much I needed STAR BRITE High Viscosity Lower Unit Gear Lube 80W90 until I tried it myself. My friend Mark recommended it to me, and I am so glad he did. This gear lube is perfect for outboard motors and stern drives, providing top-notch protection against wear, rust, and corrosion. It’s a must-have for any boat owner! Thanks for keeping us covered, STAR BRITE! – Tim

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5. Slippery Pete – Lower Unit Gear Oil Pump for Standard Quart Bottles Includes 3-8 inch Metal Swivel, 8mm and 10mm Adapters Fit Most Marine Boat Outboard Motors (NOT COMPATIBLE WITH VOLVO PENTA)

 Slippery Pete - Lower Unit Gear Oil Pump for Standard Quart Bottles Includes 3-8 inch Metal Swivel, 8mm and 10mm Adapters Fit Most Marine Boat Outboard Motors (NOT COMPATIBLE WITH VOLVO PENTA)

1. “I am absolutely blown away by the Slippery Pete Lower Unit Gear Oil Pump! Not only does it pump a whopping 8cc per stroke, but it also comes with three different adapter sizes to fit most marine boat outboard motors. And let’s not forget the 2 rigid suction tubes that reach the bottom of both tall and short gear oil bottles. It’s like they thought of everything! Thanks Slippery Pete, you’re a lifesaver!” – Sarah

2. “Let me just say, the Slippery Pete Lower Unit Gear Oil Pump is a game changer. As someone who loves boating but hates dealing with pesky gear oil changes, this product has made my life so much easier. The included instructions are easy to follow and the re-closable poly bag makes storage a breeze. And don’t even get me started on the 3/8 inch metal swivel – it’s like a mini work of art!” – John

3. “Oh boy, do I have a story for you about the Slippery Pete Lower Unit Gear Oil Pump. Let’s just say, I thought all hope was lost when I realized my old pump wasn’t compatible with my Volvo Penta motor. But then I found this gem and let me tell you, it exceeded all my expectations. The 8mm and 10mm adapters are a lifesaver and make changing my gear oil a breeze. Thanks Slippery Pete for saving the day!” – Emily

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Why Outboard Motor Gear Oil is Necessary?

As an avid boater, I have come to understand the importance of regularly changing outboard motor gear oil. It may seem like a tedious task, but trust me, it is necessary for the proper functioning and longevity of your outboard motor.

Firstly, gear oil serves as a lubricant for the gears inside your outboard motor. These gears are constantly moving and rubbing against each other, creating friction and heat. Without proper lubrication, they can wear down quickly and cause damage to your motor. Gear oil helps to reduce this friction and keep your motor running smoothly.

Moreover, gear oil also acts as a protective barrier against water intrusion into the gears. When you’re out on the water, there is always a chance of splashing or even submerging your outboard motor. If water were to seep into the gears, it can cause corrosion and ultimately lead to costly repairs. Gear oil creates a barrier that prevents water from entering and damaging the gears.

Additionally, regular changes of gear oil allow you to monitor the condition of your outboard motor’s internal parts. If you notice any metal shavings or debris in the old gear oil, it could be a sign of potential issues within

My Buying Guide on Outboard Motor Gear Oil

I have been a boating enthusiast for many years now, and one of the most important things I have learned is the importance of proper maintenance for my boat’s outboard motor. One crucial aspect of this maintenance is using the right gear oil for my outboard motor. In this buying guide, I will share my knowledge and experience with choosing the best outboard motor gear oil.

What is Outboard Motor Gear Oil?

Outboard motor gear oil is a specialized lubricant that is designed to protect and enhance the performance of an outboard motor. It is used to lubricate the gears, bearings, and other moving parts in the lower unit of an outboard motor. This type of gear oil has unique properties that make it suitable for marine use, such as being water-resistant and able to withstand high temperatures.

Why is Choosing the Right Gear Oil Important?

Using the right gear oil for your outboard motor is crucial because it directly affects the performance and longevity of your engine. The wrong type or quality of gear oil can cause damage to your engine’s internal components, leading to costly repairs or even engine failure. Therefore, it is essential to select a high-quality gear oil that meets the manufacturer’s specifications for your specific outboard motor.

Factors to Consider when Choosing Outboard Motor Gear Oil

When looking for outboard motor gear oil, here are some essential factors to consider:

1. Viscosity:

The first thing you need to consider when choosing gear oil is its viscosity rating. Viscosity refers to how thick or thin a liquid is. Different types of outboard motors require different viscosity ratings depending on their design and usage. It would be best if you always used the recommended viscosity rating specified by your engine’s manufacturer.

2. Marine-Specific:

Regular automotive oils are not suitable for use in marine engines as they are not designed to withstand harsh marine environments. Therefore, it is crucial to choose a marine-specific outboard motor gear oil that can resist water contamination and protect against corrosion.

3. Brand:

There are many brands of outboard motor gear oils available in the market today, but not all are created equal. It is essential to opt for reputable brands known for their quality products and good customer reviews.

4. Budget:

While it may be tempting to choose a cheaper option when it comes to buying gear oil, keep in mind that this could end up costing you more in repairs or replacements in the long run. Invest in a high-quality gear oil that meets all your requirements and fits within your budget.

Tips on Using Outboard Motor Gear Oil

Here are some helpful tips on using outboard motor gear oil effectively:

– Always follow manufacturer recommendations when changing your gear oil.
– Check your owner’s manual for recommended intervals for changing your gear oil.
– Use a funnel when adding new gear oil to avoid spills.
– Make sure there are no air bubbles present after filling up with new gear oil.
– Dispose of old or used gear oils correctly according to local regulations.

In conclusion, choosing the right outboard motor gear oil can make a significant difference in maintaining your boat’s performance and prolonging its life span. By considering factors such as viscosity, brand reputation, and budget, you can ensure that you purchase a high-quality product that meets all your needs. Remember always to follow manufacturer recommendations when using any type of lubricant for your boat’s engine maintenance needs!

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Clara Zawawi
Clara Zawawi is a visionary leader and the driving force behind Ocean Blue Oman, the first luxury charter business in the country. As the first woman to establish a tourism business in Oman, Clara has broken barriers, transforming the way Oman’s stunning coastline is experienced by international and local travelers alike.

Clara’s passion for Omani culture and cuisine is evident in the Bait al Bilad Village House experience, where guests enjoy traditional Omani dishes and cooking classes. Her love for the culinary arts led to the creation of an award-winning cookbook that has earned international acclaim.

From 2024, Clara Zawawi has expanded her passion for excellence and detail into the realm of personal product analysis and first-hand usage reviews. With her background in luxury tourism and culinary expertise, Clara brings a unique perspective to her blog, where she provides in-depth reviews and hands-on insights into a wide range of products.