The higher the number, the thicker the oil. The number to the right of the dash is the viscosity rating at engine operating temperature. Looking at this series of numbers and letters, note that everything to the left of the dash is the cold weather rating, as W stands for “Winter.” The lower the "W" number, the better the oil will perform at a cold temperature. All motor oils have viscosity ratings given by the the Society for Automotive Engineers, with the most common viscosity grade being 5W-30. You can find the viscosity rating directly on the oil's bottle. In order to determine which oil is right for your car's engine, you'll need to look for the viscosity rating. Keep in mind that older vehicles tend to require a thicker oil for added lubrication, no matter the climate. Like Goldilocks and her porridge, you want an oil that's neither too thin nor too thick, but one that's juuuuusssst right. You want an oil that provides thick, cushiony support for your engine when it’s running hot, but won’t turn to molasses when it gets cold. Look for the viscosity grade(s) recommended by the original equipment manufacturer (OEM), which you can locate in your owner's manual. When comparing engine oils for your ride, the most important thing to keep in mind is the oil's viscosity rating. Engine oil also helps to clean, cool, and protect your engine. Viscosity and Your Car's EngineĪs oil moves through your engine, it coats the moving engine parts so that they don’t grind against each other and wear down. Ever tried to pour peanut butter out of its jar and onto a peanut butter and jelly sandwich? Yeah.good luck with that one. Peanut butter has extremely high viscosity. Honey has a higher viscosity than water, but still flows. Water flows relatively quickly, so it is considered to have a thin or low viscosity. What's the definition of viscosity? Viscosity is a scientific term that indicates how thick or thin a liquid is. What is "viscosity" and why does it matter for your engine's oil? How do you even know where to find the viscosity rating of your motor oil? Put on your lab coat and follow along to learn how to read an engine oil label and see why it's important for your car's health! Viscosi-what?
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