Will 10w 40 oil damge craftsman mower?
It is generally not recommended to use 10w 40 oil in a Craftsman mower. Most Craftsman mowers require SAE 30 oil, which is a lighter weight oil than 10w 40. Using 10w 40 oil in a Craftsman mower can cause increased engine wear and decreased performance. It is important to always use the oil type that is recommended in your mower's owner's manual.