View Here : Kia Optima 2015
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Engine Range + Specs. Under the hood, the 2015 Kia Optima comes with a pair of powerful Theta II GDI engines. The first is the 2.4-liter GDI 4-cylinder, while the other is a 2.0-liter GDI turbo. The 2.4-liter comes with the LX, EX, and SX trim levels, while the remaining models get the more robust turbo engine.