What should you always check before starting the engine of a vessel?

Before starting the engine of a vessel, checking the oil level is crucial for ensuring the engine operates smoothly and efficiently. The oil lubricates the engine components, reducing friction and wear, which is essential for the longevity and reliability of the engine. Insufficient oil can lead to overheating, engine seizing, or catastrophic failure, which can be dangerous at sea.

While checking the fuel level, battery charge, and water levels are also important maintenance tasks, ensuring the oil level is correct is often considered a priority because it directly affects immediate engine performance and safety. Proper lubrication is foundational, and without adequate oil, any other checks may be rendered irrelevant if the engine fails to operate.