Kia Sorento 4wd 2011 Workshop Manual page 1558

^ Frequent driving on hilly or mountain type roads.
^ Repeated short distance driving.
^ 50% or more driving in heavy city traffic during hot weather above 90°F (32°C).
^ Trailer towing, or commercial operation such as a delivery service or similar use.
^ Driving on rough, bumpy, unpaved, or snowy roads.