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1st Method

Start the engine and keep the engine running at idle for 2 minutes.
Place the shift lever in 'N' and press the accelerator to maintain engine rpm at 4, 500.
Warm up the engine until engine coolant temperature reaches at 80°C (176°F).
Keep the engine running at 2, 500 - 3, 000 rpm in the N position for 15 minutes.

Courtesy of KIA MOTORS AMERICA, INC.