5W30 and 10W30 Differences
Crude oil pumped out of the ground is refined to make motor oil.
Motor oil has specific properties for use in your car, boat or small engine. The Society of American Engineers specifies standards for motor oils, and you can tell if a motor oil meets their standards by the SAE specification on the bottle. 5W30 and 10W30 are both motor oils used in automobile and other engines.