👉 The boat fluid, also known as coaxial or stern lock fluid, is a specialized lubricant used in marine vessels to reduce friction and wear between the moving parts of the boat's propulsion system, particularly around the stern lock mechanism. It forms a thin, protective film that prevents metal-to-metal contact, ensuring smooth operation and extending the lifespan of the components. This fluid is crucial for maintaining optimal performance and reliability, especially in enclosed spaces like lock chambers where water can quickly accumulate and cause damage.
