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The reader has a new Mercury four-stroke outboard that’s due for its initial oil change. Is it ok, he wonders, to fill the crankcase with the new Mercury 25W-40 Synthetic Blend oil, assuming that the motor had been shipped from the factory with “break in” oil? The short answer is yes—go ahead and use the new Mercury oil.
Outboard? Whatever floats your boat, Valvoline Full Synthetic 4-Stroke Marine Motor Oil is proven to maximize engine life. Unlike automobile engines, four-stroke marine motors face unique challenges from higher running speeds, seasonal use, and extreme operating environments that can lead to corrosion, excessive wear, and dirt deposits.
Multi-viscosity oils include 10w30 and 10w40 4-stroke boat engine oils. 4-stroke outboard oil includes special additives to meet the lubrication challenges of modern 4-cycle outboards and includes multi-viscosity options. West Marine also offers 4-cycle oils from Chevron (Delo 400), Pennzoil and Quicksilver.
10W-30 Mineral 4-Stroke Marine Engine Oil provides outstanding lubricity for internal engine components to reduce wear, scuffing and scoring for improved long-term reliability, making it a good choice for Mercury and other brand four-stroke outboard engines.
Unlike inferior, traditional marine oil, This Mercury marine oil won't damage emissions systems and works great in any marine engine with or without a catalytic converter. Made in USA. For use in 4-cycle outboard engines. Superior corrosion protection. Most recommended OEM marine engine oil.
Mercury's 4‑Stroke oil technology outperforms automotive oils in marine applications because of its specialized additive package designed for marine engines. The mineral 4‑Stroke oil is also now approved for use in all Outboard Engines; previously only our synthetic blend could make this claim. 3 things to know: For use in all 4‑Stroke ...
Valvoline Full Synthetic 4-Stroke Marine Oil is optimized for performance and durability, providing 50% stronger wear protection and 8X better defense against rust than industry standards. All without compromising acceleration and horsepower.