High Performance Boating
Get More Power, Longer Engine Life, and Reduced Maintenance Costs
"The best oil you can buy for your boat."

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 very hot, which promotes the creation of acids and engine corrosion. The longer the engine works, the more water and acid build. AMSOIL Marine Synthetic Motor Oil, Marine Gear Oils, and 2 Stroke Oils are premium quality synthetic engine oils engineered to provide maximum protection and extend engine life.
These superb marine synthetic motor oils provide:
- Maximum Performance
- Superior Protection Against Wear
(43% less wear than Mercruiser 25W40)
- Engines Last Much Longer
- Maximizes Fuel Economy
- Excellent Rust Protection
- Extended Oil Change Intervals
- Reduced Operating Costs
Top Racing Marine Engine Builder uses AMSOIL lubricants
Richie Zul is the "mad scientist" behind Zul Racing Engines in New Babylon, N.Y. Richie and his staff build high-output racing engines for some of the world's fastest boats, including the APBA Hall-of-Famer "Fever" and several Eastcoast Marine boats. Over the past ten years, they have become famous for their expertise and, today, about 50 racing boats carry "Richie Zul Engines". Recently, Zul gained the coveted APBA (American Powerboat Assoc.) Offshore Inboard Engine Builder of the Year Award.
Zul is a devoted user and installer of AMSOIL Products, "The number-one reason we use AMSOIL is for its instant-lubrication ability. This motor oil gets to problem areas very quickly and is very light on startup. With other marine engine oils, you get dry starts and it takes longer for the oil to reach the upper cylinders and pistons. And that's when a good deal of wear occurs. AMSOIL gets up into the cylinders and pistons faster than anything we've seen. AMSOIL stays fluid even at cold temperatures, and with a boat engine that can be important. It also gives us quick startups, less drag and better acceleration." These engines can propel boats to speeds of around 140 mph. "These engines are run extremely hard. With AMSOIL, we can expect a 20 - 30o F. temperature drop, and that means more power being used for output. I think AMSOIL is an outstanding marine oil, and we wouldn't use anything else."
Inboard and Outboard Marine Gasoline Engine s
AMSOIL 10W-40 and 10W-30 4-Stroke® Marine Synthetic Motor Oils are premium quality synthetic formulations engineered for the harsh operating conditions of marine environments. They 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.
AMSOIL synthetic motor oils are extended drain capable because they are synthetic oils. Synthetics are much more resistant to heat, oxidation and mechanical breakdown than are conventional oils, which helps synthetic last longer than conventional oils last.
AMSOIL synthetic motor oils are formulated with long-lasting, top-quality additives to take advantage of the durability of synthetic basestocks, and make extended drain capable oils. Finally, synthetic oils offer superior lubrication and protection to that offered by conventional oils, due to the ability of synthetics to maintain low temperature fluidity for rapid post-startup lubrication and protection and their ability to maintain a durable film of protection in high temperature operations.
Marine Diesel Engine
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil (AME) is a premium diesel oil providing excellent performance in all types of diesel engines where highly effective control of wear and deposits is vital. Built with heavy-duty dispersant/detergent additives, its 12 TBN chemistry neutralizes acids and controls soot thickening from EGR and blow-by to protect against corrosion, cylinder bore polishing (wear) and varnish/sludge deposits. AMSOIL AME resists heat and breakdown better than conventional petroleum oils for long lasting performance and protection.
AMSOIL AME can extend drain intervals far beyond those recommended for conventional petroleum oils. Its unique synthetic formulation and long drain additive system deliver the best possible engine protection, cleanliness and performance over extended drain intervals, reducing vehicle maintenance and waste oil disposal costs.
AMSOIL 15W40 Marine Motor Oil is formulated for extended drain intervals, and has proven itself in extended drain in-engine service since 1975.
- Superior Protection Against Wear
- Longer Engine Life
- Excellent Rust Protection
- Maximizes Fuel Economy
- Excels in Both High Horsepower Applications and
All-Day Cruising or Trolling Conditions
- Extended Drain Intervals
- Reduced Operating Costs
Improves fuel efficiency, power, and performance. Restores horsepower to like new. Cleans injectors, fuel screens, pumps and filters. Designed for use in all diesel engines: light and heavy duty trucks, marine diesel engines, and all on and off road equipment. One 16-oz. bottle treats 80 gallons of fuel.
Fisherman Saves Time and Money
We fish three to six days at a time, sometimes trawling 24 hours a day. The engine runs at continuous load most of the time, which is ideal for a Detroit Diesel. But there's no getting around it, really work that engine.
AMSOIL Heavy Duty Diesel and Marine Oil and the AMSOIL Dual Gard filter give me the outstanding protection I demand, and the extended drain intervals I want. I appreciate the savings in time and money.
Commercial fisherman Paul Daniels switched his Detroit Diesel 525 hp 12V-71T boat main engine over to AMSOIL Synthetic 15W40 Heavy Duty Diesel Marine Motor Oil and an AMSOIL Dual Gard By-Pass Oil Filter to increase engine life and decrease maintenance. Daniels had been changing his conventional oil at 250- to 300-hour intervals. With AMSOIL products on board, he conservatively increased his change intervals until he reached his present 2000 hour oil changes with sampling and filter changes at 500 hours.
Marine Engine Life Increases 500 Percent
More than 60,000 tourists annually visit Alpine Canyons, South Island, New Zealand for high-speed thrills on Shotover Jet Ltd. jetboats. The tourist trade is tough service for the boats. The Chevrolet 454 cu. in. V8-engined jetboats are in service 365 days a year, making up to 28 high speed river trips a day. The boats develop maximum torque at extremely low engine operating temperatures, due to the cooling effect of the snow-fed river water they draw. How does Shotover protect these hardworking engines?
With AMSOIL synthetic motor oils and AMSOIL by-pass oil filters. Before converting the boats to AMSOIL motor oil and filters, oil change intervals were at 25 hours and engine life in the 500 hour range. AMSOIL synthetic motor oil and AMSOIL by-pass oil filter combination provides 400-hour oil change intervals and engine life up to 2500 hours that's 16 times greater oil service life and five times greater engine life a huge savings for Shotover Jet Ltd.
Marine Engine Oil By Pass Oil Filter
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Marine Dual Remote Filtration System Dramatically Extends Engine Life
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Conventional oil filters cannot remove water from the oil circulation. They also do not consistently capture particles smaller than 15 microns. Research shows particles in the 5 to 20 micron size range cause up to 60 percent of engine wear. The AMSOIL By-Pass Oil Filter, used in conjunction with full flow oil filtration, removes water. It also removes virtually all particles down to three microns in size, and even removes particles smaller than three microns with greater than 50 percent efficiency. Ultra-filtered oil - like that delivered by the By-Pass Oil Filter - lasts longer and performs better than conventionally filtered oil, and that increases engine life and performance.
Engine Oil Full Flow Oil Filter
The AMSOIL Super Duty Full Flow Oil Filter offers superior filter life and filtration to that offered by conventional full flow oil filters. Its blend of cellulose, fiberglass and synthetic media and tight pleating optimize small particle capture, total particle capture, media durability and media capacity. In fact, performance tests demonstrate the AMSOIL Super Duty Filter provides over 75 percent better combined efficiency/capacity than other leading filters, and that increases filter life.
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.
2 Stroke Outboard Motors
Synthetic 2 Stroke Marine Oil
AMSOIL Synthetic 2-Cycle Oils, available in pre-mix (100:1) and injector formulations, reduce friction and wear, improve throttle response and deliver maximum power. Their clean-burning 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 antirust agents for rust inhibition during off-season storage.
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