Four-stroke engine oils

Genuine Suzuki Marine 10W-40 semi-synthetic oil designed for 4-stroke outboard engines. Formulated to deliver maximum protection and performance for Suzuki motors in marine environments – from small portables to high-output engines. Meets API SL and NMMA FC-W standards to ensure reliable operation, corrosion protection, and long engine life.

• Semi-synthetic blend – provides stable viscosity and slower breakdown under high RPM and heavy loads.
• NMMA FC-W® certified – specially built for marine use, resists water contamination, prevents rust, and minimizes deposits.
• Advanced additive package – reduces wear on moving parts, keeps the engine internals clean from carbon and sludge.
• Wide compatibility – ideal for all Suzuki 4-stroke outboards and any other brands requiring 10W-40 oil meeting API SL/FC-W specifications.

Genuine Honda 10W-30 oil for 4-stroke outboard engines, formulated to deliver optimal performance and long engine life. This high-quality lubricant meets API SJ/SL and NMMA FC-W standards, providing excellent protection against wear, corrosion, and deposits. Suitable for all Honda outboard models and other brands requiring 10W-30 viscosity.

• Specifically developed for Honda Marine – ensures compatibility with all Honda 4-stroke motors and meets factory service requirements.
• 10W-30 broad temperature range – aids cold starts and maintains a stable oil film at high operating temperatures.
• Enriched with anti-wear and anti-rust additives – extends engine lifespan by safeguarding internal components in saltwater use and during storage.
• Cleaner running and fuel-efficient – formula reduces friction for smoother engine operation and lower emissions.

Quicksilver 10W-30 4-Stroke Marine Oil is a genuine mineral oil for four-stroke outboard engines, developed by Mercury Marine. It provides reliable lubrication and engine protection in marine environments and meets the NMMA FC-W® standard for 4-stroke marine motors. The 10W-30 viscosity is particularly suited for smaller engines and moderate climates, ensuring easy starts and a stable oil film during operation.

• Mineral base with marine additives – specifically formulated to resist moisture and salt, protecting against rust and wear.
• Meets/exceeds Mercury, Mariner, and other OEM requirements for 10W-30 FC-W oil – giving you confidence in compatibility and quality for your engine.
• Excellent thermal stability – maintains its protective properties during extended operation, minimizing carbon deposits and sludge.
• Easy cold starts – the 10W rating ensures quick oil flow at startup, ideal for cooler temperatures or engines with manual pull-starts.

Quicksilver 25W-40 Synthetic Blend is a high-performance 4-stroke marine engine oil designed for both outboard and inboard boat engines. It delivers exceptional corrosion resistance and wear protection even under high RPM and heavy load conditions common in marine use.

• Semi-synthetic formula with outstanding viscosity stability in extreme temperatures and stresses.
• Meets and exceeds all NMMA FC-W standards (including catalyst-compatible), ensuring reliability and compatibility.
• Shields engine internals from rust and wear in both saltwater and freshwater environments, extending engine life.
• Versatile oil for all 4-stroke marine engines – suitable for Mercury, MerCruiser, Yamaha, Honda and more.
• Available in 1-liter and 4-liter packages for convenient top-ups or complete oil changes.

Quicksilver 25W-40 is a dependable mineral 4-stroke oil designed for inboard (sterndrive) marine engines that operate under heavy loads and high temperatures. It maintains stable viscosity and protects critical engine parts even during extreme operation and extended use.

• Formulated for powerful MerCruiser inboard motors and other 4-stroke boat engines (gasoline or older diesels) requiring 25W-40 grade oil.
• Resists thermal breakdown – the oil does not thin out excessively at high operating temperatures, ensuring consistent lubrication under stress.
• Special additive package neutralizes combustion acids and protects bearings and cylinders from corrosion during long storage or winter lay-up.
• Dissolves and prevents carbon deposits and sludge buildup, keeping the engine clean and efficient.
• Multi-season use – suitable for hard summer running as well as winter storage, providing easy start-up and engine protection year-round.

Quicksilver 25W-50 High Performance is a top-tier semi-synthetic 4-stroke oil specifically recommended for powerful Mercury Verado outboards and other high-performance marine engines. It delivers maximum lubrication and protection even at extremely high RPM and load – perfect for racing and high-speed boats.

• SAE 25W-50 formula engineered to maintain its viscosity under exceptionally high temperatures and pressures without losing lubricating effectiveness.
• Unmatched wear protection for supercharged engines and large-displacement, high-horsepower motors.
• Resists the formation of varnish and sludge deposits, even under intense thermal stress typical of aggressive operation.
• Meets and exceeds Mercury’s requirements for Verado oils, as well as NMMA FC-W standards for marine engines.
• Compatible with other brands’ high-performance 4-stroke engines (such as racing inboards) where a 25W-50 viscosity and API SL or similar oil is required.

Quicksilver 15W-40 Heavy Duty is a premium oil for marine diesel engines, engineered to meet the stringent demands of modern high-load diesels. It satisfies the API CJ-4 service category, meaning it’s formulated to protect modern turbo-diesels with Diesel Particulate Filters (DPF) and SCR catalysts, while controlling soot and deposits to keep the engine clean and efficient.

• Multi-viscosity SAE 15W-40 oil providing reliable lubrication across a wide temperature range – from cold start to full load operation.
• Advanced additives protect exhaust after-treatment systems (DPF, SCR), extending their life and keeping emissions in check.
• Excellent shear stability: the oil stays within its viscosity grade throughout the service interval, maintaining oil film thickness under heavy conditions.
• Controls formation of sludge and varnish deposits, keeping the engine clean even during prolonged idling or high-temperature operation.
• Meets Mercury MerCruiser specifications for inboard diesel engines, ensuring compliance with warranty requirements and giving owners peace of mind.

Yamalube 10W-40 is a genuine Yamaha 4-stroke engine oil engineered for optimal performance in Yamaha outboard motors and personal watercraft. This latest-generation synthetic oil exceeds API SJ and NMMA FC-W standards, providing superior protection against corrosion, wear, and deposits in the harsh marine environment.

• Specifically developed and tested by Yamaha for 4-stroke outboard engines and WaveRunner personal watercraft, ensuring perfect compatibility and performance.
• Synthetic API SJ formula with strong anti-wear additives extends engine life even at high RPM and heavy loads.
• Excellent oxidation stability – the oil protects parts from varnish and sludge formation, keeping the engine clean and maintaining full power output.
• Ensures easy cold starts and stable oil pressure even during prolonged idling/trolling at low speeds or frequent load changes.
• NMMA FC-W certified marine oil – a guarantee of reliable anti-corrosion protection in saltwater and compliance with all modern manufacturer requirements.