According to the recommendations of the Hyundai manufacturer, the oil in the automatic transmission (AT) in the Sonata model should be changed at the following times:
* Non-severe operating conditions: every 40,000 km or 2 years, whichever comes first.
* Under severe operating conditions: every 20,000 km or 1 year, whichever comes first.
Severe operating conditions include:
* Regular towing or transport of heavy loads
* Frequent driving in traffic jams or short distances
* Driving in high temperature or cold climates
If you are unsure whether your driving style is considered heavy duty, it is best to consult a qualified mechanic or consult your vehicle’s owner’s manual.
Please note that these recommendations may vary depending on the specific year and model of Hyundai Sonata. It is recommended to always refer to the instruction manual for accurate information.