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Dexron VI transmission fluid is required for a 2007 Hyundai Sonata. It is recommended to change the Sonata's transmission fluid at 105,000 miles to prevent potential damage from metal shavings and impurities. Failing to adhere to the scheduled transmission fluid change can significantly reduce the lifespan of the transmission. Regularly monitoring the transmission fluid level between maintenance appointments is crucial. Allowing the transmission fluid level to drop too low may result in improper shifting or failure to shift at all. To check the transmission fluid, simply pull out the dipstick while the engine is warm and running, and the transmission is in park.
If you have a car with automatic transmission, it is suggested to use Valvoline MaxLife ATF. Remember to be careful when dealing with Automatic Transmission Fluid, as it is hazardous. For manual transmissions, it is advised to use Royal Purple MAX Synthetic Gear Oil 75W-140.
Hyundai informed me that any high-quality sp3 transmission fluid will be suitable.