Make sure the transmission is filled with Kia-approved transmission fluid and at the correct level. Our technicians tell using incorrect transmission fluid or operating the transmission when it is low on fluid can result in internal transmission damage.Google+
Car Problem Reports
Kia Optima Use Only Kia Approved Transmission Fluid
Kia Optima Problem
Average Mileage: 55,333 mi (40,000 mi - 64,000 mi)
Visitor, 2009 Kia Optima, 64,000 mi
Car started hard enough to throw people forward when slowing to a stop. Took car to KIA dealer for diagnosis. First KIA claimed it needed an adjustment. A day later, KIA sells us a new transmission because they claim the fluid was low. I still can't figure out how you can have a low fluid condition with no sign of a leak.