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The 2008 Kia Optima comes with two engine options, the 2.4L 4-cylinder and the 2.7L V6, both requiring SAE 5W-20 full synthetic motor oil. The smaller 4-cylinder engine needs 4.5 quarts of oil, while the larger V6 engine needs 4.8 quarts. It is important to ensure that you do not underfill or overfill the engine to maintain optimal performance. While SAE 5W-20 synthetic oil is recommended, SAE 5W-30 synthetic can be used in case of emergency. It is generally better to stick to the recommended oil with the lower viscosity for longevity and improved fuel efficiency.
In 2008, the Kia Optima can hold 4.2 liters (equivalent to 4.5 US quarts) of oil, and it is recommended to use SAE 5W-20 grade oil.