Boating & Marine - Fresh & Saltwater

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AMSOIL Synthetic 15W-40 Heavy Duty Diesel and Marine Oil provides the ultimate in diesel engine protection. Specifically formulated for long-life, it resists oxidation and thermal breakdown, retains viscosity and eliminates sludge and varnish formation. Outstanding lubricity provides unbeatable wear protection and maximum fuel efficiency. It contains special performance additives for acid and soot control. Extended drain capability reduces downtime and oil expenses.

AMSOIL Formula 4-Stroke Synthetic 0W-40 Motor Oil is specially formulated to provide serious protection and performance in recreational four-stroke outboard motors. Its broad 0W-40 viscosity rating provides superior protection in both hot and cold temperature extremes. It provides superior shear stability and resistance to vaporization so engine wear, oil consumption, friction, heat and emissions are kept to an absolute minimum.


AMSOIL Marine Dual Remote Filtration System (BMK-18)

Hard-working engines come in all shapes and sizes, from heavy-duty diesels to high performance racing engines. Though seldom recognized as part of this group, marine engines include some of the hardest working, hottest running engines out there.

Marine engines, from those found in recreational watercraft to larger commercial boats, often sit idle in storage for weeks or months and when put on the water are required to run at full throttle for extended periods of time. These torturous conditions place tremendous stress on engines and engine oils. Since clean engine oil is critical for ensuring proper operation and protection, AMSOIL recommends the use of the Marine Dual Remote Filtration System (BMK-18). PDF

The AMSOIL Dual Remote and By-Pass filtration systems have been an integral part of the company's advanced engine protection product line. Building on the customer-proven success of auto- motive dual remote and by-pass filtration technology, the Marine Dual Remote Filtration System was created to address the specific severe operating environment of marine engines in both salt and fresh water. For example, the hoses are U.S. Coast Guard approved, the fasteners and the mounting brackets on the BMK-18 are stainless steel and the connectors are aluminum making them significantly corrosion resistant. Specifically designed for recreational and light commercial marine applications that use in both or inboard/outboard stern drive engines, the Marine Dual Remote Filtration system offers easily accessible remote mounting capability for a full flow spin-on oil filter and a spin-on style by-pass oil filter. This unique combination of both full flow and by-pass filtration on a single mounting manifold is the only system of this kind designed specifically for marine applications.

The effects of marine engines running predominantly at or near full throttle after extended periods of non- activity include high operating temperatures and increased potential for wear on engine components. The AMSOIL Marine Dual Remote Filtration System offers a clear advantage by providing better oil filtration, increased oil capacity, longer oil and filter life, plus the ability to remove moisture and condensation from the lubrication system. Moisture typically condenses inside engines to combine with residual combustion gases. The resulting compounds strip beneficial additives from engine oil and act as corrosive substances that further degrade the engine oil and promote engine wear. Humid environments make marine engines especially prone to these conditions. The BMK-18 greatly curbs the effects of moisture and condensation by safely retaining water within the filtration system.

Dual remote filtration is a highly efficient filtering process capable of removing the vast majority of wear causing particles which are in the 5-20 micron range. It also has the ability to remove particles down to 1 micron in size. Furthermore, a dual remote filtration system requires a 1.5 to 2 quart oil volume increase, with the added oil offering increased cooling capabilities. The additional hoses, fittings, filters and aluminum mount assemblies also allow the engine oil to dissipate heat more efficiently as it passes through the filtration system, extending the life of both the engine and the engine oil.

A large number of marine diesel engines have by-pass oil filtration systems installed by the engine manufacturer. Until now, however, this technology has not been available to smaller pleasure boats and light commercial marine applications. 
Depending on the owner's frequency of use, the improved filtration of the Marine Dual Remote system, along with the use of AMSOIL synthetic lubricants, could completely eliminate oil and filter changes during a typical boating season.

With marine engines located in a relatively confined and remote space within the watercraft, ease of filter access and-reduced oil spillage are significant benefits of the Marine Dual Remote System.
The BMK-18 is packaged in kit form, which includes the Dual Filter mount, mounting hard- ware, hoses, hose fittings, component parts and installation instructions. In addition, adapter kits of four different sizes enable the BMK-18 to be installed on a wide variety of recreational and light commercial marine engines.
The AMSOIL Marine Dual Remote Filtration System represents the cutting edge of filtration technology-another example of the company's commitment to providing quality innovations that can benefit consumers everywhere. 
The BMK-18 Adapter Kit Reference Guide (G-2051) can be found online at

AMSOIL Introduces Specially Formulated Oils for Four-Stroke Outboard Engines

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 (see four-ball wear charts).







4-Stroke Outboard Motor Warranty Certified

Formula 4-Stroke® Marine Synthetic Motor Oils are certified by the National Marine Manufacturers Association (NMMA) for use in four-stroke outboard motors. These high quality oils demonstrate outstanding performance, exceeding the NMMA “FC-W” (Four Cycle -Water) specification requirements

Only five manufacturers currently produce FC-W certified oil. Formula 4-Stroke® Marine Synthetic Motor Oils fulfill the warranty requirements of four-stroke outboard motor manufacturers.

  • NMMA Registration #FB-30010B 10W-40

  • NMMA Registration #FB-30011B 10W-30

Superior Protection Against Engine Wear

Marine engines operate under high loads and RPMs for extended periods of time, causing traditional automotive oils to break down and lose viscosity. While automobile engines normally operate at around 2,500 rpm, outboard motors can run twice as fast, requiring greater levels of wear protection and better bearing durability than automobiles. In addition, prolonged idling and low operating temperatures contribute to fuel dilution, further thinning the oil. To ensure adequate protection for their engines, marine engine manufacturers set minimum high temperature/high shear (HTHS) viscosity limits. AMSOIL Formula 4-Stroke®

Marine Synthetic Motor Oils are shear stable and formulated with sophisticated oil additive chemistry, exceeding the HTHS requirements of both the API and NMMA FC-W (see graph)

Four-stroke engines in inboard and sterndrive power plants feature horizontally mounted crankshafts, retaining a small level of oil in the bottom of the crankshaft bearings upon shutdown. This residual oil helps protect the bearings until the oil pump can supply additional oil volume. However, the design configurations of four-stroke outboard motors present a challenge to marine lubricants. Four-stroke outboards feature vertically mounted crankshafts, limiting oil retention at shutdown and increasing the likelihood of dry starts and accelerated wear. Formula 4-Stroke® Marine Synthetic Motor Oils contain a high concentration of premium quality anti-wear additives that provide an extra level of wear control upon start-up.

Excellent Anti-Rust Performance

Marine engines are prone to rust, leading to uncontrolled wear and premature engine failure. However, good rust protection is not a natural attribute of engine oil. It comes only by design. Formula 4-Stroke® Marine Synthetic Motor Oils contain maximum treatments of special rust and corrosion inhibitors that ensure long-lasting engine protection during both idle and storage periods.


AMSOIL Formula 4-Stroke® Marine Synthetic 10W-30 (WCT) and 10W-40 (WCF) Motor Oils are FC-W registered and warranty certified for use in four-stroke outboard motors. They surpass 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. Use the appropriate viscosity grade where specified in the following:

Four-stroke outboard motors:
Honda®, Mercury®, Suzuki®, Evinrude/Johnson®, Bombardier/BRP®, Yamaha®, Nissan®, Tohatsu®

Inboard and I/O:
Mercruiser®, Volvo Penta®, OMC®, Chrysler® Marine, Crusader®, Marine Power®, Chevrolet®, Ford®

Personal Watercraft:
Honda®, Yamaha®, Bombardier/BRP® (Sea Doo®), Polaris® For inboard motor applications, drain intervals may be extended to two times the engine manufacturer recommended interval or one year, whichever comes first.

Complete list of products available from AMSOIL for your Marine needs.

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