4. Forgetting to Check the Oil
What It Does: Oh, yeah, boaters neglect this all the time. Checking the oil is necessary every time you use your boat. Non-use of boats can cause seals and gaskets to fail as they dry out. This can accelerate oil leaks.
Result Of Neglect: Going to sea with a twoquart oil shortage can damage valves, rocker bearings or cranks — and very quickly at the high rpm ranges where boats run.
Cost To Perform: Free! Plus maybe 12 bucks for a quart of marine oil.
Penalty: Lose a power head or engine block and shell out $10,000 or more.