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  • Home
  • Free AMSOIL Account
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  • Save Up To 25%
  • Shop
    • View AMSOIL Products
    • AMSOIL Marine Oil
    • AMSOIL Car and Truck Oil
    • AMSOIL Diesel Oil
    • AMSOIL Heavy-Duty Oil
    • AMSOIL Snowmobile Oil
    • AMSOIL ATV/UTV Oil
    • AMSOIL Racing Oil
    • AMSOIL Dirt Bike
    • AMSOIL Motorhome Oil
    • AMSOIL Metric Motorcycle
    • AMSOIL V-Twin Motorcycle
    • AMSOIL Power Equipment
    • AMSOIL Agriculture Oils
  • Popular!
    • AMSOIL 15W40
    • AMSOIL 5W30
    • AMSOIL 0W20
    • AMSOIL Dominator
    • AMSOIL Interceptor
    • AMSOIL Diesel 4-IN-1
    • AMSOIL Synchromesh
    • AMSOIL 75W90 Severe Gear
    • AMSOIL Oil Filter
  • Where Can I Buy AMSOIL
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AMSOIL MARINE OIL & LUBRICANTS

AMSOIL Fishing Boat

BENEFITS OF USING AMSOIL FOR MARINE EQUIPMENT:

  • Excellent Wear Protection in Harsh Conditions
    The AMSOIL Marine Oil product line is specially formulated to protect marine engines from wear, even under high RPMs and heavy loads. They maintain strong film strength in both freshwater and saltwater environments.
     
  • Corrosion Resistance
    Marine engines are highly susceptible to corrosion due to moisture and salt exposure. AMSOIL Marine Oil and AMSOIL Marine Gear Oil contains powerful anti-corrosion additives that shield engine parts from rust and long-term damage.
     
  • Clean Engine Operation
    AMSOIL’s advanced detergents reduce carbon deposits, sludge, and varnish buildup, helping outboards and inboard engines run smoother, cleaner, and more efficiently—especially important for 2-stroke outboard and inboard engines, as well as 4-stroke outboard and inboard engines.
     
  • Reliable Performance in Extreme Temperatures
    Whether you're running in cold northern lakes or hot southern waters, AMSOIL Marine Oil performs consistently across wide temperature ranges, ensuring dependable starts and engine protection. Additionally, the AMSOIL Lower Unit Oil also is a top end performing lubricant.
     
  • Smokeless, Low-Emission Formulas
    AMSOIL 2-stroke marine oil products are designed for low smoke output, reducing emissions and improving environmental friendliness without compromising performance.

AMSOIL 4 STROKE MARINE OIL

AMSOIL 25W40 Marine Oil

AMSOIL 25W-40 Marine Oil

AMSOIL 25W-40 Marine Oil

AMSOIL 25W-40 Marine Oil

 Product Code: WCMQT-EA

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AMSOIL Marine Oil 10W40

AMSOIL 10W-40 Marine Oil

AMSOIL 25W-40 Marine Oil

AMSOIL 25W-40 Marine Oil

 Product Code: WCFQT-EA 

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AMSOIL Marine Oil 10W30

AMSOIL 10W-30 Marine Oil

AMSOIL 25W-40 Marine Oil

AMSOIL 10W-30 Marine Oil

 Product Code: WCTQT-EA 

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AMSOIL 2 STROKE MARINE OIL

AMSOIL HP 2 Stroke Marine Oil

AMSOIL HP 2 Stroke Marine Oil

AMSOIL HP 2 Stroke Marine Oil

AMSOIL HP 2 Stroke Marine Oil

 Product Code: HPMQT-EA 

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AMSOIL 100 Synthetic 2 Stroke Injector Oil

AMSOIL 2 Stroke Injector Oil

AMSOIL HP 2 Stroke Marine Oil

AMSOIL HP 2 Stroke Marine Oil

 Product Code: AIOQT-EA  

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AMSOIL 100 1 Premix 100 Synthetic 2 Stroke Outboard Oil

AMSOIL 10W-30 Marine Oil

AMSOIL HP 2 Stroke Marine Oil

AMSOIL 10W-30 Marine Oil

 Product Code: ATOBC-EA

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AMSOIL POWERSPORTS OIL FILTERS

AMSOIL Black Oil Filter

AMSOIL Black Oil Filter

AMSOIL Chrome Oil Filter

AMSOIL Chrome Oil Filter

 Product Code: Select

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AMSOIL Chrome Oil Filter

AMSOIL Chrome Oil Filter

AMSOIL Chrome Oil Filter

AMSOIL Chrome Oil Filter

 Product Code: Select 

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Wix Filters

Wix Filters

AMSOIL Chrome Oil Filter

Wix Filters

 Product Code: Select

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AMSOIL GASOLINE ADDITIVES

AMSOIL Quickshot Bottle

AMSOIL Quickshot Gasoline Treatment & Stabilizer

AMSOIL Quickshot Gasoline Treatment & Stabilizer

AMSOIL Quickshot Gasoline Treatment & Stabilizer

 Product Code: AQSCN-EA 

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AMSOIL Gasoline Stabilizer Bottle

AMSOIL Gasoline Stabilizer

AMSOIL Quickshot Gasoline Treatment & Stabilizer

AMSOIL Quickshot Gasoline Treatment & Stabilizer

 Product Code: ASTCN-EA 

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AMSOIL DIESEL MARINE OIL

AMSOIL 15W40 Heavy Duty Diesel Marine Oil Bottle

AMSOIL 15W-40 Heavy-Duty Diesel and Marine Oil

 Product Code: AMEQT-EA 

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AMSOIL LOWER UNIT OIL

AMSOIL Lower Unit Gear Oil

AMSOIL 75W-90 100% Synthetic Marine Gear Lube

 Product Code: AGMQT-EA 

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AMSOIL GREASE

AMSOIL Grease Tube

AMSOIL 100% Synthetic Water-Resistant Grease

 Product Code: GWRCR-EA 

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AMSOIL COOLANT & ANTIFREEZE

AMSOIL Coolant and Antifreeze Bottle

AMSOIL Powersports Antifreeze & Coolant

 Product Code: PSAFQT-EA 

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AMSOIL GENERAL PURPOSE CLEANERS & PROTECTANTS

AMSOIL General Purpose Cleaners Protectants Spray Cans

AMSOIL Powersports Antifreeze & Coolant

 Product Code: Select

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WHAT IS THE BEST MARINE MOTOR OIL?

AMSOIL IS THE BEST 2 STROKE OUTBOARD OIL & THE BEST 4 STROKE OUTBOARD OIL FOR YOUR WATERCRAFT!

AMSOIL Marine Oil is engineered to meet the unique demands of marine engines, offering exceptional protection, performance, and reliability on the water. Whether you’re powering a fishing boat, speedboat, or personal watercraft, AMSOIL’s specialized marine lubricants help ensure your engine runs smoothly and lasts longer, even under the harshest conditions.


One of the key benefits of AMSOIL Marine Oil is its ability to resist rust and corrosion, which are major concerns for marine engines due to constant exposure to moisture. Unlike conventional oils, AMSOIL uses advanced synthetic technology to form a durable barrier that protects metal surfaces from rust, even during off-season storage. This protection is vital in both freshwater and saltwater environments.


For two-stroke marine engines, AMSOIL offers high-quality marine 2 stroke oil that delivers low smoke, clean combustion, and maximum performance. This oil is specially formulated to reduce carbon deposits on pistons and spark plugs, improving engine efficiency and reducing maintenance. Boaters with 2 stroke outboard motors will particularly appreciate the cleaner burning and reduced fouling that AMSOIL provides, translating into better throttle response and more reliable operation.


In four-stroke marine engines, AMSOIL’s 25w40 marine oil and 10w30 marine oil options offer excellent protection against viscosity breakdown and wear, even under high RPM and heavy loads. These oils maintain their film strength and lubrication properties in extreme heat, ensuring that critical engine components stay protected during extended operation.


A standout product in AMSOIL’s marine line is the AMSOIL lower unit oil, which is designed to protect gear cases and lower units from wear, rust, and corrosion. This oil resists foaming and maintains its protective qualities in high-pressure environments, which helps reduce gear wear and extend the life of seals and bearings. It’s particularly beneficial for high-performance or commercial vessels that require dependable gear protection in challenging conditions.


Another major advantage of using AMSOIL Marine Oil is its extended drain intervals and superior longevity. Because AMSOIL’s synthetic base oils are more stable and resistant to oxidation, they don’t break down as quickly as conventional oils. This not only saves time and money on maintenance but also provides peace of mind for boaters spending long days out on the water.


With AMSOIL, you’re not just getting premium oil — you’re also getting the support of a strong distribution network. Whether you’re gearing up for boating season or performing routine maintenance, it’s easy to find an AMSOIL dealer near me who can provide expert advice and help you choose the right products for your specific marine engine.


In summary, AMSOIL Marine Oil offers a comprehensive solution for boat owners who demand the best in engine protection, performance, and reliability. With specialized formulations for both 2-stroke and 4-stroke engines, corrosion-resistant properties, and high-temperature durability, AMSOIL stands out as a top choice in marine lubrication.

AMSOIL Guys in Fishing Boat on Lake

Frequently Asked Questions About Marine Oil & Lubricants

No, substituting automotive heavy-duty oil like Rotella T in a boat engine is not recommended. Marine engines operate under different conditions - constant RPM, high moisture, and potential salt exposure - requiring specialized lubrication and corrosion protection. 


Using the wrong engine oil can lead to engine wear and failure. For maximum performance and protection, use AMSOIL Marine Oil, specifically formulated for marine environments. It’s considered one of the best outboard oil options, delivering superior rust prevention and heat resistance. For boaters seeking the best outboard motor oil and the best oil for outboard 4 stroke engines, AMSOIL's marine-specific oils ensure longevity and reliability. 


The temperature limit for 25W-40 marine oil is designed to handle a wide range of operating conditions common in marine environments. Typically, a marine oil 25W40 viscosity provides excellent protection in high-heat situations up to about 100°F (38°C) and beyond, making it ideal for sustained high RPM and heavy loads. This will be dependent on a number of factors such as how well the engine is maintained to the type of punishment the motor is subject to.


Premium options like AMSOIL Marine Oil offer superior thermal stability and oxidation resistance. Using 25W40 synthetic marine oil from AMSOIL Inc. ensures better performance under extreme temperatures, reducing the risk of breakdown and deposits. Further, for ultimate protection, the 25W40 marine oil by AMSOIL delivers advanced corrosion protection and maintains viscosity even in severe conditions, making it a top choice for demanding marine applications. 


Yes, using automotive gear oil in your boat’s gearbox can harm seals and cause premature wear. Marine gearboxes operate in a unique environment with constant exposure to water and high torque loads, requiring oils formulated to resist moisture, prevent rust, and maintain proper lubrication under these conditions. Automotive gear oils often lack the necessary additives to protect against water contamination, which can lead to seal swelling, leaks, and gear failure.


For optimal protection, choose products like AMSOIL Marine Gear Oil such as the AMSOIL Synthetic Marine Gear Lube 75W-90, specifically designed for marine applications. These oils provide superior corrosion resistance and excellent film strength. Whether you need a lower unit gear oil, or a specific type of lower unit gear lube, marine-specific formulations like AMSOIL Marine Gear Lube ensure durability and reliability. 


Always use a dedicated marine gear lube to protect your boat’s lower unit and extend the life of your gearbox seals. Many owners consider the AMSOIL lower unit oil as one of the best on the market!


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