Top 10 Best 4 stroke outboard motor in 2026

Main highlights

• •Mercury 25W-40 Marine Engine Oil features high-tech, advanced anti-wear additives that provide up to 35% better camshaft wear protect
• •Designed to maintain engine reliability and performance, tests have shown that Mercury 25W-40 Marine Engine Oil holds its viscosity ratings longer in industry wear-testing than other oils on the market.
• •Mercury Oil, combined with a Mercury Oil Filter will offer optimum marine engine protection.
• •NOTE: It is recommended that boat owners change their engine oil annually or as noted in their owners manual.

Main highlights

• •Everything you need for an oil change on all 40-60hp Mercury outboards in one box
• •Kit includes (3) 1L bottles of Quicksilver 25W-40 4-stroke marine engine oil, Quicksilver premium oil filter, drain plug seal and drip tray
• •Quicksilver 4-stroke marine engine oil is formulated with advanced corrosion inhibitors and provides outstanding lubricity to reduce wear, scuffing and scoring for improved long-term engine reliability
• •Part number 8M0081912
• •NMMA FC-W and FC-W Catalyst Compatible

Main highlights

• •Everything you need for an oil change on all 150hp Mercury and Mariner outboards in one box
• •Kit includes (5) 1L bottles of Quicksilver 10W-30 4-stroke marine engine oil, Quicksilver premium oil filter, drain plug seal and drip tray
• •Quicksilver 4-stroke marine engine oil is formulated with advanced corrosion inhibitors and provides outstanding lubricity to reduce wear, scuffing and scoring for improved long-term engine reliability
• •NMMA FC-W and FC-W Catalyst Compatible

Main highlights

Main highlights

• •Genuine OEM Factory Original Equipment Lubricant
• •For use in Mercruiser Inboard & Sterndrive engines
• •For use in Mercury Verado outboard motors
• •Superior corrosion protection
• •Most recommended OEM marine engine oil

Main highlights

• •Superior corrosion protection
• •Size: 32oz
• •10W-30
• •Superseded From: 92-858045K01
• •Outstanding lubricity for internal engine components to reduce wear, scuffing and scoring

Main highlights

• •50% stronger wear protection to meet the extreme heat and higher RPM demands of 4-stroke marine engines
• •Up to 8X better rust defense. Running or stored, your marine engine takes in moisture. Left unprotected this exposure can lead to severe rust damage
• •Engineered specifically for the unique demands of marine motors
• •Premium full synthetic formula for performance and durability in extreme conditions
• •American made and formulated, from the Original Motor Oil brand trusted for more than 150 years

Main highlights

• •Temperature: 60℃/140℉
• •fit Yamaha outboard models:F9.9C, FT9.9D, F13.5A, F15A, F20A, F25A, FT25B, F30A, F40A, F40B, F40F, F50A, FT50B, F60C & FT60B
• •Replaces Thermostat Part OEM Number#: 66M-12411-00 66M-12411-01
• •This items Include the Thermostat & Gasket, as show on the picture. If you are unsure, please provide your engine serial number.

Main highlights

• •Powerful Performance: Four-stroke 6.5-horsepower outboard motor delivers stable, robust propulsion with a load capacity of 661-1653 lbs. The three-blade propeller minimizes resistance while balancing thrust for optimal efficiency.
• •Agile Steering Control: Manual steering and tilt angle adjustments via handlebar, with reverse gear for enhanced maneuverability.
• •Durable Construction: Premium plastic and aluminum alloy materials deliver exceptional strength, wear resistance, and corrosion protection for extended service life.
• •Water-Cooled System: The 4-stroke outboard motor features a water-cooling system that effectively prevents engine overheating, enhancing operational stability and reliability.
• •Continuously Variable Transmission: The boat motor enables stepless speed adjustment between 5000-6000 RPM by rotating the throttle handle, achieving cruising speeds of 6.2-12.42 mph. Experience thrilling adventures on the water.