SAE 10W-30 Formula
Marine Synthetic Motor Oil (WCT)
1-Quart Bottles (case of 12)
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.
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).
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 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 periods.
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. Use the appropriate viscosity grade where specified in
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®
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.
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