AMSOIL Marine Motor Oils

AMSOIL 10W-30 Synthetic Marine Engine Oil
AMSOIL 10W-30 Synthetic Marine Engine Oil
AMSOIL 10W-40 Synthetic Marine Engine Oil
AMSOIL 10W-40 Synthetic Marine Engine Oil
AMSOIL 25W-40 Synthetic Blend Marine Engine Oil
25W-40 Synthetic Blend Marine Engine Oil
AMSOIL Outboard 100:1 Pre-Mix Synthetic 2-Stroke Oil
Outboard 100:1 Pre-Mix Synthetic 2-Stroke Oil
AMSOIL HP Marine Synthetic 2-Stroke Oil
HP Marine Synthetic 2-Stroke Oil
Marine Outboard
Marine Outboard
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AMSOIL Products for Marine Applications
A successful day fishing or boating hinges on the reliability of marine engines. Deposits and wear from high-rpm operation and all-day trolling can limit performance and even shorten engine life, especially in newer engines that run hotter and produce more power. AMSOIL synthetic marine lubricants, including Formula 4-Stroke® Marine Synthetic Motor Oil (WCT, WCF) and HP Marine™ Synthetic 2-Stroke Oil (HPM), are formulated to control harmful deposits and wear in outboard, inboard and sterndrive motors.

AMSOIL products are ideal for boaters because they effectively reduce time and money spent on maintenance and increase fuel economy. In fact, research reveals maintenance and fuel costs are foremost on the minds of boaters. The top three reasons ex-boaters cited for giving up their boats are cost of maintenance/ storage (41.1%), cost of fuel (21.5%) and time constraints (20.6%).
Demanding Operating Conditions
Marine motors are characterized by high-rpm operation that can shear the molecular structure of oil and reduce its ability to protect against wear. On average, a marine motor propelling a boat 30 mph operates at 5,000 rpm,

while an automotive engine at 60 mph operates around 2,000 rpm. The added heat and stress invite wear and deposits. Heavy deposits can cause piston rings to stick. Stuck rings lead to compression loss, which reduces power. Stuck rings can also lead to catastrophic piston scuffing.

The marine operating environment creates additional challenges for oil. Marine motors are constantly exposed to humid air. The moisture the motor ingests increases the likelihood of corrosion compared to automotive engines. Water-cooled marine motors also run at lower temperatures than air-cooled engines, so moisture in the oil doesn’t evaporate as readily. Plus, when the motor is shut down for the day, moist air continues to enter the engine as it cools, increasing the risk for corrosion, especially if the oil doesn’t contain anti-corrosion inhibitors.
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