![]() This measure of an oil's rate of flowing through a calibrated orifice due to gravity alone is known as the oil's kinematic viscosity. The more time it takes for the cup to empty, the higher the oil's viscosity at that temperature. Traditionally, motor oil viscosity has been measured using a device called a viscometer, which is basically a cup with a calibrated hole or tube on the bottom. You can pour a glass of apple juice a lot more quickly than you could pour a glass of molasses. ![]() The higher the viscosity, the thicker the oil, and the more resistant it will be to flow. It may help to think of apple juice as a low-viscosity fluid, and molasses as a high viscosity fluid. Oils with higher viscosities are thicker and will flow more slowly. Oils with lower viscosities are thinner and will flow more easily. Simply-stated, viscosity refers to an oil's resistance to flowing at a given temperature. ![]() But what do those numbers mean in plain language? When a jug of oil says "10W-40" or "5W-30, for example, those numbers refer to the oil's viscosity. A motor oil's viscosity, sometimes called its weight, is usually the most prominent specification on the oil's label. ![]()
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