The gear oil must perform a delicate balancing act, providing a stable film strength to prevent metal-to-metal contact while resisting the emulsifying effect of water intrusion. The 'W' in 80W-90 stands for 'Winter,' indicating that this multi-grade formulation behaves like a 80-weight oil in cold conditions, allowing for easier cold-start lubrication, while acting as a 90-weight oil under high operating temperatures.
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Mineral Oil: Making the Right Choice. Understanding Viscosity and Its Critical Role Viscosity is the single most important property to consider when selecting 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. For boaters in regions with significant seasonal temperature swings, a multi-grade 80W-90 often provides the best year-round protection, ensuring the fluid remains fluid enough to circulate during startup yet robust enough to protect the gears during peak summer heat.
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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. Without this protection, metal components would grind against each other, leading to rapid wear, overheating, and ultimately, a catastrophic failure that leaves the boat stranded.
More About Lower unit gear oil
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