2. Not Changing Gear-Case Lube
What It Does: Changing gear-case lube regularly — usually every 100 hours and again for winterization — maintains optimal lubricity and also gives a heads-up on developing problems, such as leaking seals or eroding gears.
Result Of Neglect: Moisture and condensation can erode lubricity and damage gears. Worse, you might not discover leaking seals in time to save the gear case from catastrophic failure.
Cost To Perform: You can change gear-case lube easily in your driveway for $30.
Penalty: A new gear case can cost as much as $5,000.