Triax Marine Ultra Full-Synthetic 10W-30 Marine Engine Oil — 5 Quart, FC-W/API SM/JASO MA, High-Temp Stability

Triax Marine Ultra 10W-30 is a true full-synthetic 4-stroke marine engine oil engineered to protect inboards, outboards, inboard/outboards, supercharged watercraft and personal watercraft under heavy marine use.

Built to meet NMMA FC-W, API SM and JASO MA specifications, this oil combines friction modification, enhanced thermal stability and superior viscosity control to resist wear, reduce heat and extend component life in saltwater and freshwater environments. It’s formulated to deliver longer protection than conventional and synthetic-blend oils, making it suitable for high-revving and loaded marine engines that demand reliable lubrication and consistent performance over extended runs.

How does Triax Marine Ultra 10W-30 protect engines during long, hard runs?

Its full-synthetic base and additive package form a strong lubricating film that reduces metal-to-metal contact and resists breakdown at elevated temperatures. Stability and viscosity retention help maintain oil pressure and protect bearings, rings and gears even under continuous high-load conditions.

• True full-synthetic formulation for longer life than blends
• Friction modifiers lower wear and operating temperatures
• High film strength under heavy torque and power output
• Consistent viscosity control for extended runs

Will this oil work with my manufacturer’s requirements?

Triax Marine Ultra 10W-30 is engineered to comply with NMMA FC-W and carries API SM and JASO MA performance markers, making it compatible with many major marine OEM recommendations. Always cross-check your engine manual, but it’s formulated to meet the needs of Kawasaki, Volvo, Mercury and Yamaha installations among others.

• Meets NMMA FC-W for 4-stroke outboards
• API SM and JASO MA rated to match OEM guidelines
• Designed for gasoline-fueled inboards, outboards and PWC
• Safe for supercharged and high-output marine engines

How does this oil handle saltwater, storage and seasonal use?

The formula resists oxidation and maintains stability during long storage periods and repeated heat cycles, which reduces sludge and varnish risk. It delivers dependable wear protection in continuous saltwater exposure and can keep performance after sitting for up to two years if stored properly.

• Excellent thermal and oxidative stability for storage
• Resists corrosion and wear in saltwater conditions
• Maintains viscosity after extended off-season layups
• Reduces deposit formation during repeated warm/cool cycles

What are the practical benefits for fuel economy and maintenance?

Friction-modifying additives reduce internal drag and lower operating temperatures, which can improve fuel efficiency and ease starting under load. Longer oil life and enhanced protection mean fewer oil changes and reduced wear-related maintenance when compared to conventional oils.

• Friction modification for reduced internal drag and heat
• Potential for improved fuel economy under similar operating conditions
• Longer protection reduces frequency of oil changes versus conventional oils
• Helps extend life of bearings, pistons and valve train components

Who is this for? Triax Marine Ultra 10W-30 is ideal for boat owners, professional captains and watersports enthusiasts who operate gasoline 4-stroke inboards, outboards, stern drives, personal watercraft or supercharged marine engines and want a high-performance full-synthetic oil that meets NMMA FC-W, API SM and JASO MA standards. It’s especially suited to vessels that run long hours, face high loads or spend time in saltwater and for anyone seeking extended protection and reduced maintenance intervals compared with conventional lubricants.