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The 2011 Kia Sorento with a 2.4-liter 4-cylinder engine requires 4.9 US quarts of 5W-20 oil, while the Sorento with a 3.5-liter 6-cylinder engine needs 5.5 US quarts of the same oil. Although 5W-30 can be used as a substitute, the manufacturer prefers 5W-20. Oil and filter changes should be done every 7,500-10,000 miles or 12 months with fully synthetic oil, or every 3,000-5,000 miles or 6 months with conventional oil. The benefits of synthetic over conventional oils include improved lubrication, longer service intervals, and better performance in extreme weather conditions. Thinner viscosity synthetic oils flow more easily in cold weather, providing efficient coating to engine components for enhanced protection against friction and corrosion.
In 2011, the best engine oil to use for the Kia Sorento is either SAE 5W-20 or 5W-30, with a preference for SAE 5W-20. The 2.0 engine in the 2011 Kia Sorento requires 4.9 quarts (4.6 liters) of oil.