What type of motor oil be used in grass cutting?

For grass cutting, specifically in lawn mowers with four-stroke engines, it's generally recommended to use SAE 30 oil, especially in warmer temperatures. In colder conditions, a multi-viscosity oil like 10W-30 can be suitable. For two-stroke engines, a mix of gasoline and a two-stroke oil is typically used, following the manufacturer's specifications. Always consult the lawn mower's manual for the best recommendations for your specific model.