Equivalent SAE Grade
The SAE, or Society of Automotive Engineers, has assigned grades to motor oil. These grades are used to select the proper motor oil when filling your automobile. As a reference, the ISO specifications state that grade 32 oil is the SAE equivalent of a 10W motor oil.
The viscosity of a liquid is the measure of its resistance to flow. In other words, the actual thickness of the liquid. This is measured in units of centistokes at a temperatures of 40 degrees Celsius and 100 degrees Celsius. ISO specifications state that grade 32 oil should be 32 censtistokes at 40 degrees Celsius, and 5.4 centistokes at 100 degrees Celsius.
The density is a measure of the mass of an object per unit size. ISO specifications measure grade 32 oil in a unit size of meters cubed, or m3. In one cubic meter of grade 32 oil, the density should be 857 kilograms. This is expressed as: grade 32 oil = 857kg/m3.
The flash point of an object is the temperature at which it becomes unstable and explodes or combusts. This is measured as a unit of temperature. ISO specifications state that the flash point of grade 32 oil is 221 degrees Celsius, or 430 degrees Fahrenheit.