AMSOIL Marine Outboard & Personal Watercraft Products

ProEdge Lubricants helps boaters and riders find AMSOIL products for two water-ready applications: marine outboard engines and personal watercraft, also called PWC.

Start with the AMSOIL lookup guides to match your exact year, make, model, engine and recommended viscosity. Then build around the oil with lower-unit gear lube, fuel treatment, storage protection and water-resistant grease.

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ProEdge Lubricants is operated by an Authorized AMSOIL Dealer.

Why Use Marine-Specific AMSOIL Products?

Marine engines and personal watercraft operate in wet, humid conditions and can spend long periods stored between uses. Outboards and PWC also run under sustained load and high rpm, so the right oil has to do more than lubricate.

AMSOIL marine products are engineered for marine service, including protection against wear, deposits, rust and corrosion. Use the lookup guides first whenever vehicle or equipment selection matters.

Find the Right Product First

Use the correct AMSOIL guide before ordering oil, filters or related maintenance products.

Always follow your engine or watercraft manufacturer’s service procedures and maintenance intervals.

Four-Stroke Marine Outboard & PWC Oil

AMSOIL Synthetic Marine Engine Oil is built for gasoline-fueled four-stroke marine engines, including outboards and personal watercraft. It is designed for demanding marine operation, including all-day trolling, high-rpm use, deposits, rust and corrosion.

AMSOIL 10W-30 100% Synthetic Marine Engine Oil

Use this option when the AMSOIL lookup guide or your owner’s manual calls for 10W-30 marine engine oil. It is NMMA FC-W Catalyst Compatible and engineered for four-stroke marine use.

View AMSOIL 10W-30 100% Synthetic Marine Engine Oil

AMSOIL 10W-40 100% Synthetic Marine Engine Oil

Use this option when your outboard or personal watercraft calls for 10W-40 marine engine oil. It is a strong match for high-rpm four-stroke marine applications where the guide recommends it.

View AMSOIL 10W-40 100% Synthetic Marine Engine Oil

AMSOIL 25W-40 Synthetic-Blend Marine Engine Oil

Use this option when the lookup guide or owner’s manual calls for 25W-40 marine engine oil. It is NMMA certified for use in four-stroke outboards, inboards, stern-drives and personal watercraft where the listed specifications apply.

View AMSOIL 25W-40 Synthetic-Blend Marine Engine Oil

Two-Stroke Outboard & PWC Oil

Two-stroke outboards and personal watercraft vary by fuel system, oil-injection setup, pre-mix ratio and manufacturer requirements. Use the product page and lookup guide before changing oil type or mix practices.

AMSOIL HP Marine® 100% Synthetic 2-Stroke Oil

HP Marine® is designed for high-performance two-stroke marine engines. It helps prevent deposits, protects against wear and rust, offers low smoke and low aquatic toxicity and can be used as injection oil or at 50:1 pre-mix where appropriate.

View AMSOIL HP Marine® 100% Synthetic 2-Stroke Oil

AMSOIL 100:1 Pre-Mix 100% Synthetic 2-Stroke Outboard Oil

This product is engineered for pre-mixed two-stroke outboard motors, personal watercraft and jet boats that specify TC-W3. It is designed to help reduce varnish and carbon deposits, improve idling and throttle response and inhibit rust and corrosion.

View AMSOIL 100:1 Pre-Mix 100% Synthetic 2-Stroke Outboard Oil

AMSOIL 100% Synthetic 2-Stroke Injector Oil

This option is designed for two-stroke outboards and other recreational equipment where TC-W3 or API-TC oils are specified. AMSOIL notes that HP Marine® should be used for Evinrude factory-lean settings.

View AMSOIL 100% Synthetic 2-Stroke Injector Oil

Lower-Unit & Gearcase Protection

Lower units and marine gearcases are exposed to heavy loads, water, shock-loading and corrosion risk. Gear lube is one of the most important add-on products for outboard maintenance.

AMSOIL 75W-90 100% Synthetic Marine Gear Lube

AMSOIL Marine Gear Lube is designed for fresh- and saltwater applications requiring 75W-90 or 80W-90 gear lube. It protects gears and bearings, helps control damage from shock-loading caused by propeller cavitation and protects against rust and corrosion.

View AMSOIL 75W-90 100% Synthetic Marine Gear Lube

AMSOIL Marine Gear Lube Pump

Use the AMSOIL Marine Gear Lube Pump to help reduce mess when servicing lower units with quarts of AMSOIL Synthetic Marine Gear Lube.

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Fuel Treatment & Seasonal Storage Products

Marine outboards and personal watercraft often sit between weekends, seasons or long storage periods. These fuel and storage products fit naturally with oil-change and lower-unit service.

AMSOIL Quickshot® Gasoline Treatment and Stabilizer

Quickshot® helps clean varnish, gum and debris that can clog carburetors, fuel injectors and fuel filters in powersports equipment and small engines. It also addresses ethanol-related performance issues and helps stabilize fuel during short-term storage.

View AMSOIL Quickshot® Gasoline Treatment and Stabilizer

AMSOIL Gasoline Stabilizer

AMSOIL Gasoline Stabilizer helps keep fuel fresh during storage for up to 12 months, resists varnish and gum buildup and is ideal for stored seasonal equipment, including boats.

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AMSOIL Engine Fogging Oil

AMSOIL Engine Fogging Oil is a rust preventive designed to protect internal engine components during storage or long periods of inactivity. It is ideal for outboard motors and other two- or four-stroke equipment.

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Water-Resistant Grease for Marine Support Points

For wet-duty service points, boat trailers and components exposed to water, use a grease designed to stay in place and fight corrosion.

AMSOIL Synthetic Water-Resistant Grease

AMSOIL Synthetic Water-Resistant Grease is formulated for wet-duty performance, water-washout resistance, corrosion protection and heavy-load service. It is suitable for applications frequently exposed to water, mud, snow or ice, including boat trailers.

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Outboard & PWC Maintenance Checklist

Use this checklist as a starting point before the season, after heavy use or before storage.

  • Confirm engine oil, viscosity and capacity with the AMSOIL lookup guide.
  • Replace the engine oil and filter where applicable.
  • Service lower-unit or gearcase lube when required.
  • Treat fuel for regular use, ethanol-related concerns or storage.
  • Fog the engine before long storage when appropriate.
  • Grease wet-duty fittings and trailer components where specified.
  • Follow the manufacturer’s service interval and maintenance procedure.

For Marine Shops, Guide Services & Rental Fleets

If your business services boats, operates a rental fleet, runs guide boats or maintains multiple outboards and personal watercraft, explore AMSOIL business programs for the account type that fits your operation.

Explore AMSOIL Business Programs

Shop Marine Outboard & PWC Products

Use the lookup guide first when fitment matters. Then shop engine oil, two-stroke oil, marine gear lube, fuel treatment, fogging oil and water-resistant grease from AMSOIL.

Find Your Outboard Fit
Find Your PWC Fit
Shop AMSOIL Marine Products
Join as a Preferred Customer
View AMSOIL Limited Warranty Details