Without a consistent film of high-pressure lubricant, metal components would grind against each other, generating heat and wearing down surfaces rapidly. The most common and recommended formulations are true gear oils, which contain extreme pressure (EP) additives specifically designed to prevent metal-to-metal contact under high loads.
Break In Oil Change Lower Unit: Essential Steps
These gears operate under immense pressure and sliding friction, especially during turns and when the engine is placed in gear. Manufacturers specify particular viscosity grades and additive packages designed for the unique operational environment of a lower unit.
This procedure typically involves draining the old fluid, replacing the gear case oil seal, and refilling with fresh manufacturer-specified oil. Replace the oil seal to prevent future leaks and contamination.
Break In Oil Change Lower Unit: Essential Steps
Thereafter, an annual change, or every 100 hours of operation, is a general guideline for most boaters. Hydraulic pressure for the shifting and trim systems.
More About Outboard motor lower unit oil
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