The numbers preceding the 'W' or found alone indicate the thickness of the oil at specific temperatures, with higher numbers signifying a thicker fluid that resists being squeezed out from between the gears. A common industry standard is the SAE (Society of Automotive Engineers) grading system, similar to that used for engine oil, but tailored for the high-pressure environment of a gear case.
Understanding the Harsh Conditions Facing Lower Unit Gear Oil
Extreme Pressure (EP) additives are crucial for handling the shock loads and sudden direction changes common in boating, while rust and oxidation inhibitors protect against the corrosive nature of water intrusion. This specialized fluid bathes the gears, bearings, and drive components housed within the lower unit, protecting them from the immense pressures generated during operation.
Using the wrong viscosity can lead to inadequate lubrication or excessive drag. Mineral Oil: Making the Right Choice.
Understanding the Harsh Conditions Facing Lower Unit Gear Oil
The Difference Between 80W-90 and 90 Gear Oil When comparing 80W-90 versus 90 gear oil, the distinction lies in their performance across temperature ranges. Always consult the vessel's owner manual for the manufacturer's specific viscosity recommendation.
More About Lower unit gear oil
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