AMSOIL offers a complete line of products geared toward the special needs of marine craft and machinery.

What's the unique problem of the marine engine? Water. Water promotes rust corrosion and rapid wear. Freshwater-cooled boats operate cool, which promotes in-engine condensation and rust. Closed-system marine engines tend to operate hot, which promotes the creation of acids - and engine corrosion. The longer the engine works, the more water and acid build, and the acid and water continue to work after engine shutdown.

AMSOIL has created a complete line of synthetic lubrication products which directly address the unique conditions of each type of marine craft.

AMSOIL Synthetic 15w-40 Heavy Duty Diesel and Marine Oil, specifically formulated for marine diesel or gasoline engines, and AMSOIL Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil contain tough, dependable anti-rust agents that shield engine metals from water. Both are formulated with 12 Total Base Number for dependable, long-lasting acid inhibition and corrosion protection. Generally, motor oils average 7 TBN, significantly lower corrosion protection than the 12 TBN of AMSOIL 5W-30 and 15W-40.

The anti-rust, anti-corrosion protection of AMSOIL 5W-30 and 15W-40 is especially important during periods of lay-up when standing water may do great harm.

15W-40 Heavy Duty Diesel and Marine Oil

The ultimate in diesel engine protection. Specially blended long-life formulation resists oxidation and thermal breakdown - retains viscosity and eliminates sludge and varnish formation. Designed to deliver 1,000,000 miles in over the road trucks before engine overhaul.
Product Code: AME

Series 3000 5W-30 Heavy Duty Diesel Oil

Fuel efficient formula for both gasoline and diesel fleets. Deliver up to 82 percent greater wear protection than other popular diesel oils. Series 3000 resists oil breakdown from heat, blow-by chemicals and oxygen up to ten times longer than conventional oils.
Product Code: HDD

Four-stroke gasoline engines have long been a mainstay of the general marine industry. They have succeeded in reducing emissions and increasing fuel efficiency, and they have also been a hit with consumers. In fact, Mercury Marine has seen its four-stroke outboard sales surpass its two-stroke sales. When four-stroke outboard motors were introduced to the market, manufacturers recommended either their own specially formulated oil or an API SG or SL automotive oil. However, because the specific lubrication requirements of automobiles and outboard motors are different, it soon became apparent that four-stroke outboard motors would require their own oil specification. This standard, entitled FC-W, was released by the National Marine Manufacturers Association (NMMA) in August 2004.

New AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oils are premium quality synthetic formulations engineered for the harsh operating conditions of marine environments. They withstand the intense mechanical activity of continuous, high RPM operation to deliver superior viscosity protection. Formula 4-Stroke® Marine Synthetic Motor Oils are specially fortified with a heavy treatment of advanced additives that protect motors against wear, rust and deposits, and they excel in both high horsepower applications and all-day trolling conditions.

Formula 4-Stroke Marine 10W-30 Motor Oil

AMSOIL Formula 4-Stroke® Marine Synthetic 10W-30 (WCT) Motor Oil is FC-W registered and warranty certified for use in four-stroke outboard motors. It surpasses the FC-W four-stroke outboard motor performance requirements established by the National Marine Manufacturers Association (NMMA) and are recommended for gasoline-fueled four-stroke outboard, inboard, stern drives (inboard/outboards) and personal watercraft motors.
Product Code: WCT

Formula 4-Stroke Marine 10W-40 Motor Oil

AMSOIL 10W-40 Formula 4-Stroke® Marine Synthetic Motor Oil (WCF) is a premium quality synthetic formulation engineered for the harsh operating conditions of marine environments. It withstands the intense mechanical action of continuous, high RPM operation to deliver superior viscosity protection. Formula 4-Stroke® Marine Synthetic Motor Oil is specially fortified with a heavy treatment of advanced additives that protects motors against wear, rust and deposits. It excels in both high horsepower applications and all-day trolling conditions.
Product Code: WCF

Synthetic 2 Cycle Oils
AMSOIL Synthetic 2 Cylce Oils, available in pre-mix (100:1) and injector formulations, reduce friction and wear, improve throttle response and deliver maximum power. Their clean-burning ashless formulations prevent plug fouling and carbon deposits, delivering quick dependable starts, sustained power and performance with virtually no smoke and emissions, even during prolonged idling. AMSOIL 2-cycle oils contain anti-rust agents for rust inhibition during off-season storage.

Dominator 2-Cycle Racing Oil
AMSOIL Dominator 2-Cycle Racing Oil retained 17.6 percent more power in lubricity tests run against petroleum and synthetic TC-W3 reference oils. The outstanding lubrication and protection offered by Dominator 2-Cycle Racing Oil to two-cycle engines subject to the flat-out performance demands of racing minimizes power-robbing friction and prevents piston scuffing and seizure.

Dominator 2-Cycle Racing Oil also burns much cleaner than conventional two-cycle oils, ensuring engine cleanliness and maximum performance.

Dominator 2-Cycle Racing Oil outperforms manufacturer-recomended two-cycle oils and may be used as a replacement for them.

Dominator 2-Cycle Racing Oil

New AMSOIL DOMINATOR Synthetic 2-Cycle Racing Oil is a robust formulation specially engineered for unsurpassed protection in high performance two-cycle motors, both on and off the track. It contains heavier synthetic base oils that provide more lubricity for "on the edge" operation. DOMINATOR reduces friction and protects pistons and bearings subjected to the rigors of racing. DOMINATOR contains the right additives for clean motor operation.
Product Code: TDR

Interceptor High Performance Synthetic 2-Cycle Oil

AMSOIL INTERCEPTOR Synthetic 2-Cycle Oil is formulated with a proprietary blend of the finest synthetic base oils and additives available today. This unique AMSOIL chemistry represents a breakthrough development in the field of two-cycle engine lubrication.
Product Codes: AIT

HP 2-Cycle Injector Oil

New AMSOIL HP Injector Synthetic 2-Cycle Oil is a precise synthetic formulation that exceeds the lubrication demands of modern two-cycle engines. It contains premium synthetic base oils and MAX-DOSE additive system, providing superior performance in direct fuel injected (DFI), electronic fuel injected (EFI) and carbureted outboard motors, as well as other recreational two-cycle equipment.
Product Codes: HPI

Saber 2-Cycle Oil, 100:1 Pre-Mix

New AMSOIL Saber Professional Synthetic 2-Cycle Oil is specifically designed for lean mix ratios in pre-mix applications. Saber Professional contains high temperature detergents for small power equipment. Extensive testing shows superior lubricity and cleanliness properties at lean mix ratios with this premium synthetic formulation.
Product Codes: ATP

Saber Outboard 2-Cycle Oil, 100:1 Pre-Mix

New AMSOIL Saber Outboard Synthetic 2-Cycle Oil is specifically designed for lean mix ratios in pre-mix applications. Saber Outboard contains lower temperature dispersants for water-cooled outboard motors. Extensive testing shows superior lubricity and cleanliness properties at lean mix ratios with this premium synthetic formulation.
Product Codes: ATO

75W/80W-90 Universal Synthetic Marine Gear Lube
AMSOIL Universal Synthetic Marine Gear Lube is an exclusive AMSOIL formulation of synthetic base oils and high performance additives that address the specific concerns of marine applications. It is extreme pressure (EP) additive fortified for superior protection of fast accelerating, high torque/horsepower engines. It protects against shock loading from cavitation of heavily loaded engines.

AMSOIL Universal Synthetic Marine Gear Lube is water resistant. It maintains extreme pressure protection even when contaminated with as much as 10% water. It promotes longer seal life, preventing excessive water leakage. AMSOIL Universal Synthetic Marine Gear Lube protects against rust and is compatible with aluminum, copper and brass alloys.

Synthetic Marine Lower Unit Gear Lube
AMSOIL Synthetic Marine Lower Unit 80W-90 GL-4 Gear Lube is formulated for outboard and stern drive lower unit gears and bearings. It is a long-life extreme pressure gear lube that provides outstanding prtection against friction and wear.

AMSOIL Lower Unit Gear Lube contains extra long lasting corrosion inhibitors formulated for freash and saltwater protection. AMSOIL Lower Unit Gear Lube resists water contamination and deterioration, providing dependable service and protection in wet operations. AMSOIL Lower Unit Gear Lube contains dependable anti-foam agents, ensuring the maintenance of a protective lubricating film devoid of wear-promoting entrained air.

AMSOIL Lower Unit Gear Lube offers low temperature fluidity for cold water protection, performance and fuel efficiency. Its high temperature lubricating film ensures dependable protection during normal and high stress operations.

75W/80W-90 Universal Synthetic Marine Gear Lube

AMSOIL Universal Synthetic Marine Gear Lube is recommended for fresh and salt water applications requiring either 75W-90 or 80W-90 viscosity grade and meeting either API GL-4 or GL-5 performance standards.
Product Codes: AGM

SEVERE GEAR Synthetic Extreme Pressure 75W-90 Gear Lube

AMSOIL SEVERE GEAR™ provides performance beyond that possible with conventional gear oil. These AMSOIL custom products offer superior gear and bearing protection, better friction and heat reduction, increased efficiency and extended service life.
Product Code: SVG

Long Life 75W-90 Synthetic Gear Lube

Specifically engineered for extended drain intervals up to 500,000 miles as set by equipment manufacturers for over-the-road trucks and heavy equipment. Prevents wear and improves equipment life. Excellent "All Season" summer and winter performance. Outperforms all conventional gear oils. Also excellent for passenger cars and trucks. Compatible with most limited-slip differentials.
Product Code: FGR

AMSOIL Synthetic Greases provide superior protection and friction reduction under both normal and the severe operating conditions you regularly encounter in marine situations. The AMSOIL greases can be counted on to remain in the places that they are needed and to provide stable overall lubrication in even the most severe service conditions. Tests prove once again that AMSOIL greases are the best way to protect and prolong the life of your marine equipment.

Heavy Duty Grease

Extreme-pressure, moly-fortified. Provides outstanding protection for four wheel drive steering knuckles, spring shackles and other components operating in high-load, low-speed conditions.
Product Code: GHD

Multi-Purpose Grease

Reduces friction and wear in high-speed/high-temperature components such as automotive wheel bearings and electric motors. It keeps components running clean and trouble-free for outstanding performance and long life.
Product Codes: GLC

Water Resistant Grease

Resists water washout and degradation. Unparalleled protection for boat trailer wheel bearings and other components frequently exposed to water.
Product Code: GWR

X-treme Food Grade Grease

AMSOIL X-Treme Synthetic Food Grade Grease is an ultra-premium aluminum complex grease designed for food service and pharmaceutical industry equipment where there is a possibility of incidental contact.
Product Code: GXC

Fifth Wheel and Open Gear Compound

AMSOIL Fifth Wheel and Open Gear Compound is based on proprietary technology that does not use asphaltic materials, residual compounded oils or diluent solvents as part of the lubricant formulation. It provides excellent adhesion to surfaces, resistance to water washout and protection against rust, corrosion, and wear. It is an aerosol spray product, making application quick, easy, neat and economical.
Product Code: GFW

Automatic Transmission Fluid

Improves fuel efficiency, reduces transmission temperatures and increases transmission life. Provides unsurpassed thermal stability and up to five times the service life of conventional ATFs. Delivers maximum protection for towing and other severe-duty applications.
Product Code: ATF

PI Performance Improver Gasoline Additive

Ideal for both fuel injected and carbureted systems. Dissolves and removes fuel system deposits and other contaminants for improved power and overall performance in gasoline engines. Improves engine idle, response and starting.
Product Code: API

Series 2000 Octane Boost

Improves the performance of all two-cycle and four-cycle gasoline-fueled engines. Just one treatment significantly increases engine response and power. AMSOIL Octane Boost reduces engine knock, improves ignition, helps fuel burn cleaner and inhibits corrosion. Recommended for all high performance off-road and racing applications. Increases octane number by up to 7 points.
Product Code: AOB

Diesel Fuel Modifier
(light-duty diesel engines)

Improves combustion, fuel efficiency, cold-weather starting, power and performance. Cleans injectors, fuel screens, pumps and filters. For use in diesel-powered cars and light-duty trucks. Treats up to 40 gallons.
Product Code: ADM

Diesel Fuel Additive Concentrate

All-season performance. Lowers diesel fuel gel point by 20° to 35° F, depending on mix ratio. Improves the performance, fuel efficiency and longevity of diesel engines while reducing deposits, black smoke, emissions and injector wear. For use in heavy-duty diesel engines. Treats up to 100 gallons.
Product Code: ADC

Cetane Boost Diesel Fuel Additive (all diesel engines)

Improves combustion efficiency to increase power in diesel engines. Raises cetane three to seven numbers. Also improves low-temperature starting, fuel ignition quality and reliability. Treats up to 200 gallons.
Product Code: ACB

MP Metal Protector

AMSOIL Metal Protector is a synthetic, greaseless all-purpose lubricant that provides metal surfaces with a long-lasting film. Its penetrating agents cut through rust and corrosion to allow free movement of hardware parts. Effective in applications as diverse as hardware, household appliances, sporting goods and electrical equipment.
Product Code: AMP

MPHD Heavy Duty Metal Protector

AMSOIL Heavy Duty Metal Protector is the product of choice for metal surfaces that require a heavy duty lubricant or are exposed to the damaging effects of salt, moisture or chemical corrosion. It is ideal for hinges, wire ropes and springs, nuts and bolts, motorcycle or bicycle chains, and for undercoating car doors, wheelwells, rocker panels, seams and other metal surfaces exposed to water, dirt or road salt.
Product Code: AMH

Power Foam Engine Cleaner and Degreaser

Cleans entire combustion intake system for improved engine performance. Removes gum, varnish and carbon deposits for better fuel economy and improved overall engine performance. Cleans intake valves, intake manifolds and throttle plates to keep the combustion intake system running at peak efficiency. Effective in both two-cycle and four-cycle engines.
Product Code: APF

Engine Flush

AMSOIL Fast Acting Engine Flush is made from a carefully selected blend of solvents and special cleaning agents that dissolve and disperse harmful deposits formed in the crankcase, cylinder walls, pistons and rings of an internal combustion engine. When used as directed, it cleans and restores operating efficiency to valves, valve lifters, rocker arms, and pistons for improved horsepower, fuel economy, and performance.
Product Code: AEF