Always adhere to the recommended fuel mixture ratio as specified in the owner's manual. Using an incorrect ratio can damage the engine. When preparing the fuel mixture, use good-quality unleaded gasoline and 2-cycle engine oil designed specifically for air-cooled or water-cooled engines, depending on your chainsaw's type.
Remember to shake the fuel container thoroughly to mix the gasoline and oil properly. Avoid using fuel mixtures older than 30 days, as they can deteriorate and potentially damage the engine. For optimal performance and longevity of your Craftsman chainsaw, it is crucial to use the correct fuel mix ratio as designated by the manufacturer.