Which type of fuel should NEVER be used in a chainsaw?

Using unleaded gasoline without the proper oil mixture in a chainsaw is highly detrimental to the tool's functionality and longevity. Chainsaws operate with a specific blend of gasoline and oil, typically a two-stroke oil, that ensures proper lubrication of internal components. This lubrication is crucial for preventing excessive wear and overheating of the engine.

When only gasoline is used, without the necessary oil mixture, the engine components can become damaged due to lack of lubrication, leading to seized parts, increased friction, and ultimately engine failure. This is why it is essential to adhere strictly to the manufacturer's specifications regarding fuel mixtures to maintain optimal performance and ensure the chainsaw operates safely and effectively.

While some other fuel types like diesel can harm the engine in their own right, the absence of the necessary oil in unleaded gasoline is particularly critical because it directly compromises the fundamental operation and health of the chainsaw engine.