AMSOIL Synthetic Marine Engine Oil Australia

AMSOIL synthetic marine engine oils for 2-stroke and 4-stroke marine engines, engineered to protect against wear, deposits and demanding on-water operating conditions.

AMSOIL synthetic marine engine oils are engineered for the demanding operating conditions experienced by boat and marine engines, including sustained high loads, extended periods of operation and exposure to moisture. Purpose-designed formulations provide excellent wear protection, cleanliness and dependable performance throughout the boating season.

Browse the AMSOIL marine engine oil range below for specialised 2-stroke and 4-stroke lubricants designed for outboard, inboard and other marine engine applications.

6 Products Found

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HP Marine 2-Stroke Engine Oil HPM

From $53.95

Outboard 100:1 Pre-Mix 2-Stroke Powersports Oil ATO

From $32.95

Heavy Duty Diesel & Marine 15W-40 Engine Oil AME

From $50.95

Marine 10W-30 Engine Oil WCT

From $60.95

Marine 10W-40 Engine Oil WCF

From $60.95

Marine 25W-40 Engine Oil WCM

From $55.95

AMSOIL Synthetic Marine Engine Oils

Marine engines operate under conditions that differ significantly from typical automotive applications. Sustained engine speeds, heavy loads, extended periods of operation and exposure to a marine environment place specialised demands on engine lubricants.

AMSOIL synthetic marine engine oils are formulated for appropriate outboard, inboard and other marine engine applications, providing dependable protection against wear, deposits, oxidation and lubricant breakdown during demanding recreational and commercial use.

Why Marine Engines Need the Right Oil

A boat engine can spend long periods operating under substantial load. Unlike a road vehicle that regularly accelerates and decelerates or cruises with relatively light engine load, marine engines may maintain elevated engine speeds for extended periods while continuously working against the resistance of the water.

These operating conditions make resistance to heat, oxidation and deposit formation important characteristics of a marine engine lubricant. The oil must continue to protect bearings, valvetrain components, pistons and other critical surfaces throughout sustained operation.

Four-Stroke and Two-Stroke Marine Engines

Marine lubrication requirements differ according to engine design. Four-stroke engines use circulating crankcase oil, while two-stroke engines require specialised lubricant that is consumed during operation through oil injection or fuel mixing. These products are not interchangeable simply because they are intended for marine use.

Always identify the engine type, required viscosity and applicable performance specifications before selecting a marine lubricant.

Complete Marine Lubrication

Engine oil is only one part of marine maintenance. Gearcases and other drivetrain components require their own purpose-designed lubricants. Browse AMSOIL application recommendations for compatible marine engines and equipment to identify suitable engine oils and supporting lubricants for your application.