Can 10w40 be used for electric chainsaw blade?

No, 10W-40 motor oil should not be used for an electric chainsaw blade. Electric chainsaws typically require bar and chain oil specifically designed for their lubrication needs, which is formulated to cling to the chain and provide proper lubrication while preventing gumming. Using motor oil instead can lead to poor performance and potential damage to the chainsaw. Always refer to the manufacturer’s recommendations for the appropriate lubricant.