![]() ![]() However, if you are unsure what to use always defer to the manufacturer’s recommendation. If the warranty is no longer in effect, you can exercise your personal preferences. Failure to do so can result in the denial of claims under the warranty. If your vehicle is under warranty, use the oil they recommend. First, what oil viscosity does the vehicle’s manufacturer recommend? Second, do you drive long distances, or do mostly stop-and-go driving? Third, what weather conditions do you normally drive in? Manufacturer’s RecommendationĬheck your car’s owner manual or contact a local dealership and ask what viscosity oil is recommended for your vehicle. Therefore, a 10W-30 rating actually translates to a viscosity rating of 10 in the winter, and 30 during warmer weather.Ĭhoosing the right viscosity oil for your car is a simple matter of considering three important facts. ![]() For example, the rating “10W-30” means the oil’s viscosity is “10” in cold temperatures, and “30” in warm temperatures. In multi-grade oils two different numerical grades are given. As the SAE rating increases, so does the viscosity of the oil. The lower the SAE number the lower the oil’s viscosity. The SAE (Society of Automotive Engineers) uses a numerical designation to rate oil’s viscosity. The thickened oil clings to your engine’s internal parts, increasing the lubrication provided by the oil. Refiners place special additives in the oil to make it thicken when heated. ![]() This is counter-intuitive, and tends to be the most confusing aspect of understanding motor oil viscosities. Motor oil however, thickens as it heats up and thins as it cools down. We expect oil to thin out as it heats up and to thicken as it cools down. Oil tends to thicken, or increase in viscosity, at low temperatures and thin out, or decrease in viscosity, at higher temperatures. Viscosity is a measurement of oil’s weight, and actually describes how thick the oil is. Choosing the correct viscosity oil for your car’s engine requires some basic understanding of oil viscosity and its ratings. ![]()
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