What should be done with the crankcase oil when storing an engine over a season?

When storing an engine for an extended period, it is crucial to drain the old crankcase oil and refill it with new oil. Over time, used oil can become contaminated with dirt, moisture, and combustion byproducts, which can lead to corrosion and wear on engine components. By draining the old oil, you remove these harmful contaminates and help prevent potential engine damage during storage.

Refilling with fresh oil ensures that the engine is protected from rust and other issues that may arise from inactivity. Fresh oil also provides better lubrication and can support the engine's internal components during the initial start-up after storage. This practice is especially important for small engines, which may not be used frequently and need to be in optimal condition when brought back into service.