The viscosity of engine oil is found where?

The viscosity of engine oil is typically measured using a viscometer, which assesses the oil's resistance to flow at specific temperatures. This property is crucial for determining how well the oil will lubricate engine components under varying operating conditions. Viscosity is often reported as a grade, such as 5W-30, indicating the oil's flow characteristics at low and high temperatures. Manufacturers provide viscosity ratings to help consumers select the appropriate oil for their engine's requirements.