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.
Transmission Damage Due to Low and/or Incorrect Fluid on Kia Sorento
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Yes, it is important to use proper fluid as indicated in your manual. Some transmissions have brass parts which degrade with the wrong fluid and result in damage. Pay attention to the API rating as well as weight. Both should not be deviated from.