Join Date: Dec 2005
Location: Winchester, Calif
Drives: 2003 S-10 Had an 03 LX 3.5 Sorento
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To avoid confusion lets get the terms correct.
A flush is generally accepted as using a machine to power flush the trans by reversing the flow of fluid. That can lead to problems. It can knock loose tiny particles that get stuck in the tiny orifices in the valve body.
A fluid exchange can be done by machine or the transmission. It does not reverse the flow but " exchanges" the fluid. It is usually done will less force and is easier on the trans.
Kia does not condone "flushes". Drain and fill every XX,XXX thousand miles(per your service schedule) is all you need to do to maintain warranty. If there is a filter that should be done according to the service schedule also.
If you choose to exchange the fluid and it makes you feel better then do it.