SAE 30 is a single-grade oil that is commonly used in small engines, including those found in craftsman riding lawnmowers. It is a non-detergent oil, which means that it does not contain any additives that would keep dirt and debris suspended in the oil. As a result, SAE 30 oil should be changed more frequently than detergent oils.
SAE 10W-30
SAE 10W-30 is a multi-grade oil that is also commonly used in craftsman riding lawnmowers. It is a detergent oil, which means that it contains additives that help to keep dirt and debris suspended in the oil. This allows SAE 10W-30 oil to be used for longer periods of time than SAE 30 oil.
The best way to determine which type of motor oil is right for your craftsman riding lawnmower is to consult the owner's manual. The owner's manual will specify the recommended oil type and weight for your particular model.