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2 STROKE, 10W-30, 10W-40 & 25W-40



AMSOIL Marine Oil 10W30



AMSOIL Marine engine oil 10W30 is an outstanding product designed to enhance the performance and longevity of your marine engines. Its specialized formula offers superior lubrication, reducing friction and wear while ensuring smooth operation in demanding marine environments. With its exceptional protection against rust and corrosion, you can trust this marine gas oil to keep your engine in top condition, maximizing efficiency and minimizing downtime on the water. Get it now for your DIY oil change or take it to a boat mechanic near me!

AMSOIL Marine Oil 10W40



AMSOIL 10W40 Marine oil is an exceptional product crafted to optimize the performance and extend the life of your marine engines. Its advanced formula delivers excellent lubrication, reducing friction and wear, ensuring smooth and reliable operation in challenging marine conditions. With its outstanding protection against rust and corrosion, AMSOIL Marine oil 10W40 is the ideal choice for maintaining your engine's efficiency and reducing downtime, allowing you to enjoy more time on the water. 

AMSOIL Marine Oil 25W40



AMSOIL Marine Oil in the 25W40 viscosity is a top-tier product designed to maximize the performance and longevity of your marine engines. Its expertly formulated blend delivers exceptional lubrication, reducing friction and wear for smooth, dependable operation in harsh marine conditions. With superior protection against rust and corrosion, AMSOIL 25W40 marine oil ensures your engine remains efficient and well-maintained, minimizing downtime and allowing you to fully enjoy your time on the water.

AMSOIL HP Marine Oil



AMSOIL HP Marine oil is a premium, top-end oil specifically engineered to elevate the performance and durability of your 2 stroke marine oil operated engines. Its advanced formulation provides excellent lubrication, reducing friction and wear while ensuring smooth and reliable operation even in extreme marine conditions. With outstanding protection against rust, corrosion, and deposit formation, this synthetic 2 stroke oil is the ultimate choice for maintaining your engine's efficiency, reducing downtime, and enhancing your boating experience.

AMSOIL 2 Stroke Injector Oil



AMSOIL Injector oil is a superior, top-end oil designed specifically to optimize the performance and longevity of your 2 cycle marine oil equipment. This marine oil is a cutting-edge formulation that provides outstanding lubrication, minimizing friction and wear to ensure smooth, reliable operation in challenging marine conditions. With its exceptional ability to prevent rust, corrosion, and deposit formation, this injector oil is the ultimate choice for maintaining your 2 stroke boat motor oil operated equipment's efficiency, reducing downtime, and delivering an exceptional boating experience.

AMSOIL Outboard Oil



AMSOIL Outboard oil is a premium, top-tier Marine 2 stroke oil that is expertly formulated to maximize the performance and extend the life of your marine equipment. Providing superior lubrication, it reduces friction and wear for smooth, dependable operation in harsh marine environments. With its exceptional ability to protect against rust, corrosion, and deposit buildup, AMSOIL 2 Stroke Outboard oil is the ultimate choice for maintaining your outboard engine's efficiency, minimizing downtime, and ensuring a superb boating experience, especially for 2 cycle boat motor oil operated machinery!


AMSOIL Marine Oil 10W30

AMSOIL Synthetic Marine gas oil, is a premium oil for 2 stroke and 4 stroke gas engines, and is made to resist the heat and strain of high-rpm operation and to provide outstanding wear protection. This marine oil line is a high-performance synthetic engine oil designed specifically to cater to the unique demands of marine engines. Its advanced formulation provides exceptional wear protection, friction reduction, and thermal stability, promoting optimal engine performance and extended life in both freshwater and saltwater environments. The oil's superior detergency properties ensure internal engine components remain clean, preventing harmful deposit buildup and maintaining peak performance. With excellent cold-weather fluidity, this marine oil line and other AMSOIL marine gear lube, guarantees smooth starts and reduced strain on the engine. This premium synthetic motor oil is the ideal choice for boating enthusiasts, from anglers to hydroplanes to offshore powerboat racing, seeking exceptional protection, performance, and reliability for their engines.

It offers corrosion and rust protection, even when it's in a boat storage facility and not running, to keep your engine protected throughout times of inactivity and prolonged storage. Hardcore anglers and boat enthusiasts who expect the best protection for their marine engines will love this marine oil. AMSOIL 2 stroke marine oil and AMSOIL 4 stroke marine oil are the best you can use! Become an AMSOIL Preferred Customer and get up to 25% off on your order!


AMSOIL Outboard Oil

The AMSOIL Marine oil line is the ultimate choice for boating enthusiasts looking to enhance the performance and longevity of their boats and marine equipment. Its advanced formulation delivers exceptional lubrication, reducing friction and wear for smooth, reliable operation even in extreme marine conditions. With unparalleled protection against rust, corrosion, and deposit formation, these marine gas oil offerings ensures your engine remains efficient and well-maintained, allowing you to fully enjoy your time on the water relaxing or during events with competition boats.

Designed to conquer the challenges of the marine environment, these marine oil products deliver outstanding performance for a variety of boat engines, including offshore boat race engines, making it a favorite among boat owners. With an impressive formulation focused on fighting engine wear, resisting viscosity loss, protecting the engine, and guarding against compression loss, it's no surprise that this product is not available at any marine store, but is is purchased through a Authorized AMSOIL Dealer, and chosen by users of Honda, Mercury, Yamaha, Johnson/Evinrude, Bombardier/BRP, Suzuki, Nissan, Tohatsu, OMC, Volvo-Penta, Mercruiser, Chevrolet, Ford, and other brands.



For boat engines, one of the most challenging threats is wear, which can shorten an engine's lifespan significantly. These boat motor oil products addresses that concern by creating a strong protective barrier on the engine parts. Its robust formulation significantly reduces friction, providing wear protection, and ensuring the longevity of the engine. It is perfect for offshore racing!


Boat engines often operate under severe conditions, causing many marine oils to lose their viscosity over time. However, the products are designed to resist viscosity loss even under harsh conditions. Its superior synthetic formula maintains viscosity, providing consistent lubrication and ensuring optimal engine protection and performance.



The engine's compression is critical for its power output, especially during boat competitions like Mercury marine racing, and loss of compression can compromise the performance of a boat engine. These products offers superior protection against compression loss, maintaining the engine's power and performance. By reducing deposit formation, it also keeps the engine clean, further ensuring its efficiency and longevity.


Boat engines are prone to rust and corrosion, especially during periods of inactivity or in boat storage, such as when offshore powerboats are in the shop and anglers store for the winter in colder environments. These synthetic marine engine oil products boasts exceptional anti-rust performance, forming a protective layer that guards against rust and corrosion. This feature makes it an ideal choice for protecting engines during off-season storage, or for any periods of inactivity.


When compared to other marine oils, these products often comes out on top. Some oils struggle to offer robust wear protection, leading to premature engine wear and reduced lifespan. Additionally, many fail to resist viscosity loss under high-stress conditions, compromising their ability to provide consistent lubrication and engine protection.

While other marine oils may not guard effectively against compression loss, these product's superior formulation ensures optimal compression, maintaining engine power and performance, especially with competition boats during events like Mercury marine racing. Further, not all marine oils offer effective rust protection, especially during periods of storage and inactivity, making this product's exceptional anti-rust performance stand out.


Given its myriad of benefits, it's no surprise that this marine motor oil line has gained significant popularity among boat owners. Users across a wide range of brands, including Honda, Mercury, Yamaha, Johnson/Evinrude, Bombardier/BRP, Suzuki, Nissan, Tohatsu, OMC, Volvo-Penta, Mercruiser, Chevrolet, and Ford, have chosen this product for its reliable performance and superior protection. This also includes owners of antique outboard motors, many of whom have chosen this product for their engines!

Boat owners often report noticeable improvements in engine performance and longevity when using these products, contributing to its strong reputation in the boating community and during boat competitions. Whether for a high-powered speedboat, a leisurely yacht, or a hardworking fishing boat, boat owners know they can rely on this synthetic engine oil for exceptional marine engine protection and performance.

Overall, this marine oil line sets a high standard in the world of marine lubrication. Its comprehensive approach to engine protection and maintenance, combined with its resilience under harsh conditions, makes it a trusted choice for boat owners worldwide. Its impressive formulation and reliable performance demonstrate a commitment to quality and performance that is both admirable and essential in the world of marine engine care.

Furthermore, these marine boat oils are designed to provide outstanding performance across a range of marine applications, from Mercury marine outboard motors to inboard engines and personal watercraft. With its commitment to quality and innovation, This company continues to set the industry standard for marine oil, marine gear oil, other marine gas oil and lubricants, giving boat owners the confidence they need to navigate the open waters with ease. Choose these oils for the ultimate protection and performance for your marine equipment. Check out our other products for all your equipment and machinery needs!


Remember, this product is not available in big box stores like Wal Mart or Costco, nor at any boat dealer. It is priced in line with Quicksilver 2 stroke oil, Evinrude 2 stroke oil, Mercury 2 stroke oil and other 2 and 4 cycle motor oils! It can only be bought through an AMSOIL Authorized Dealer, like us here at HIGHGRADE Lubricants!


AMSOIL Powerboat Championship Logo

The company's participation in boat racing has created a robust, dynamic partnership in the marine engine world that reverberates across many competitions. When one speaks of boat racing, like Mercury racing, it's important to clarify that there are numerous types of races, each with its unique requirements and challenges. As such, AMSOIL's contribution goes beyond sponsoring races; it involves meticulous research, development, and manufacturing of high-performance lubricants that help power these boats to their peak performance. See the Racing Oil section for more product options for the type of boat racing you are into!

Drag boat racing and offshore powerboat racing are two prominent areas where this company has made its mark. In drag boat racing, raw power, speed, and the ability to withstand intense pressure are the name of the game. These boats, built for lightning-fast straight-line racing, require lubricants that can handle high heat and extreme stress without losing viscosity or breaking down. The commitment to drag boat racing is reflected in the high-quality racing oils they produce.

This is where the company's involvement goes beyond mere sponsorship and branding. The racing motor oil line has been engineered with these specific requirements in mind. Each formulation is designed to optimize power output, maintain a strong protective film that reduces friction and wear, and deliver unrivaled performance under extreme operating conditions.

The benefits of using this synthetic motor oil in these races are multifold. The most apparent advantage is the enhanced engine performance. With reduced friction, the engine operates more efficiently, leading to increased power output and top speed, critical in winning a race.

But perhaps a less immediately noticeable, yet equally important, benefit is the extended engine life. Using a high-quality racing oil reduces wear on marine engine components, leading to fewer breakdowns and less frequent need for engine overhauls. This equates to less downtime and lower maintenance costs in the long run, a significant advantage in a sport where the cost of competing is often prohibitively high.

Moreover, this product is designed to resist breakdown under extreme heat and stress. In the high-pressure environment of a boat race, like Mercury racing, where engines are pushed to their limits, conventional oils can break down, reducing their effectiveness and potentially causing engine damage. This synthetic engine oil maintains its protective properties, even under these extreme conditions, ensuring the engine remains protected throughout the race.

With its commitment to quality and performance, the company has become an integral part of the boat racing world. The company's involvement extends beyond branding and sponsorship; it provides the very lifeblood that powers these high-performance racing machines. By designing and manufacturing racing oil that enhances performance, prolongs engine life, and protects under extreme conditions, the company has made a significant contribution to the boat racing industry. Its reputation as a trusted partner in boat racing has grown, and with it, the anticipation for what innovative solutions it will bring to the sport in the future.


Team AMSOIL marked a significant milestone with a dominant performance at the UIM/SBI Offshore World Championships in Key West, Florida. Arriving early in the first week, the team set up base at the Truman Annex area of the island, joining over 50 other offshore race teams for this intense, week-long event in 2014.

The meticulous preparations and extensive testing paid off in the traditionally challenging waters of Key West. When the race began, the Team seized an early lead and held it to the end, finishing almost a minute ahead of second-placed Popeye’s racing.

However, the race presented rougher conditions. Despite a late start, the Team maintained a close chase on Team Popeye’s, who managed to secure an early lead. Despite the Team posting faster lap times, Popeye’s managed to finish just three seconds ahead. Nevertheless, their aggregate performance ensured they held the overall lead on time and speed.

The event also provided a unique opportunity for fans to engage with their favorite teams. The Team participated in an offshore boat parade in downtown Key West, selling team merchandise and interacting with enthusiastic fans.

With the Team and Popeye’s evenly matched from earlier races, it was the ultimate decider. The Team spent all day preparing, adjusting prop and gear ratios to ensure optimal performance. The conditions were challenging, but Team AMSOIL pulled ahead early on. After a suspense-filled race, Popeye’s boat capsized, leaving the Team to carefully complete the race and secure the UIM/SBI Super Cat class championship.

The championship victory capped a highly successful season for the Team, who also claimed the Cat Lite High Points Title in the OPA Racing Circuit, The Geico Triple Crown, and the Offshore Super Series National Championship and High Points Title for Cat Lite. Following these string of victories, the Team prepared for a new challenge at California's Salton Sea.

The Team's continued success can be attributed to the superior 15W50 Dominator Racing engine oil and other lubricants, which were used in every part of their racing boat. The team expresses its gratitude to AMSOIL for its sponsorship and to AMF Offshore Racing for their support in promoting the sport of offshore powerboat racing. 

AMS OIL Boat on Water


AMSOIL Authorized Dealer Logo

Purchasing marine oil products from HIGHGRADE Lubricants, an Authorized AMSOIL Dealer, delivers a host of benefits, designed to ensure your watercraft's peak performance and longevity. This company, a reputable name in the world of synthetic motor oil, offers an impressive range of marine engine oils tailored to provide superior engine protection under harsh marine conditions.

One of the key benefits of buying from an Dealer is the potential for discount pricing with free shipping on most orders. These Dealers often run special promotions and offer competitive rates, providing exceptional value for your investment. With marine mechanical oil products, you're not just saving upfront but also in the long run due to their superior quality and performance.

Furthermore, Authorized Dealers provide direct access to the manufacturer, its is similar to having a discount card and sales representative in one package! This means that customers can easily reach out to the company for technical support, product queries, and any other assistance they might need. This level of service extends beyond merely selling products, delivering a holistic customer experience that's centered around ensuring the best care for your watercraft and marine racing equipment. 

In summary, choosing a Dealer for your marine engine oil needs offers a winning combination of cost savings and direct manufacturer access. It's a decision that guarantees genuine products, expert support, and exceptional value for your investment, ensuring your marine engine performs at its best.


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