Answer
Aug 22, 2024 - 12:24 AM
A Mercruiser engine typically requires SAE 25W-40 marine engine oil, specifically formulated for marine environments. Mercruiser recommends using their own branded Quicksilver 25W-40 synthetic blend oil, which is designed to provide optimal protection and performance under the unique conditions marine engines face, such as high humidity, saltwater exposure, and prolonged periods of high RPM operation.
This oil is formulated to:
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Protect against corrosion: Marine engines are more exposed to moisture and salt, so this oil includes additives to prevent rust and corrosion.
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Maintain viscosity under load: The 25W-40 blend is thick enough to provide adequate lubrication at high temperatures, which is essential when the engine is under heavy load.
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Reduce wear: The oil contains additives that minimize wear on critical engine components, extending the life of your engine.
While Quicksilver 25W-40 is the recommended oil, if it’s not available, you can use other marine-specific oils that meet or exceed the NMMA (National Marine Manufacturers Association) FC-W certification standards.
