4.75 / 5.0
(4) 4 total reviews
Full synthetic 25W-40 4-stroke marine oil for high-output outboards, sterndrives, and inboard gasoline engines.
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Description
- Designed for 4-Stroke Outboard Engines that Require FC-W: Use in gasoline-fueled four-stroke inboards, outboards, inboard/outboards, supercharged watercraft engines, and personal watercraft
- True Full Synthetic Formulation: Delivers up to twice the life and protection of conventional and synthetic blend oils, ideal for high-powered marine engines running long hours under heavy loads
- Compatible with All Major Marine OEMs: Including Kawasaki, Volvo, Mercury, and Yamaha, offering superior performance and protection compared to OEM lubricants
- Unmatched Wear Protection: Even in continuous saltwater use, with excellent stability and viscosity control for up to two years of storage and extreme high-temperature operation
- Friction Modified: For reduced wear, less heat, improved fuel economy, and high film strength under heavy torque and power output
Specifications
- API SM
- JASO MA
- NMMA FC-W
OEM Cross-Reference
• QuickSilver 25W-40
• Mercury Marine 25W-40

The twin Mercruiser 4.3Ls love this oil, they run a lot quieter and start up is even smoother.
I've been on the Triax bandwagon for only a few months now, and after product after product im just impressed with brand.
I purchased this marine oil as I'm a believer in synthetic oils for a lot of reasons that would take to long to list. My major reason along with being synthetic is it's the only full synthetic oil on the market in the range 25w-40 for my outboard. Mercury outboard (4 stroke) requires this weight when using full synthetic oil. My 90 hp runs quieter and starts easier when cold with this oil my kicker motor hasn't been changed over yet but come spring if will be. I'm so far a full convert to Triax oils only thing that would change that would be a down turn in quality or engine failure due to poor quality product. Triax don't change just get local sales locations.
I have been using Mercury 25W40 oil for over 20 years in my Mercruiser stern drive engines. I got tired of paying a very high price for semi synthetic oil and waiting for Mercury to come out with a full synthetic. I also like the 5 quart container vs the Mercury 4 qt container. I am a dedicated TRIAX user now.
25w40 marine oil, 5 gallon bucket leaked out a small amount of oil around the lid seal, the box needs up arrows so the delivery drivers know the proper orientation of the package so maybe it wound not leak. the oil it self seems to be preforming great in my boat engine 1998 Volvo Penta 5.7l GS 350 CID Chevy engine
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