10W-40 Formula 4-Stroke®
Marine Synthetic Motor Oil (WCF)
Package sizes include:
1-Quart Bottles (case of 12)
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 chart).
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
(Four Cycle - Water) specification requirements. Only seven
manufacturers currently produce FC-W certified oil. Formula
4-Stroke® Marine Synthetic Motor Oils fulfill the warranty
requirements of four-stroke outboard motor manufacturers.
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.
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
AMSOIL Formula 4-Stroke® Marine Synthetic 10W-40 (WCF) 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.
Use the appropriate viscosity grade where specified in the
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
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