What weight oil is use on craftmans 18 chainsaw bar oil?

Craftsman 18-inch chainsaws typically use bar and chain oil specifically designed for lubricating the bar and chain during operation. It's generally recommended to use a lightweight, high-quality oil, often in the range of SAE 30 or a dedicated chainsaw bar oil that provides better adhesion and protection. Always check the owner's manual for specific recommendations based on the model you own.