Join Date: Jun 2012
Drives 2014 Sonata 2.0T Limited
Drives 2014 Genesis 3.8
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The Hyundai Sonata auto transmission is now considered a sealed system. There is a check point but no dip stick for fluid level inspection. I would suggest reading the owners manual under service recommendation for the drain and fill timing. I believe its safe to say don't touch it until at least 60,000 miles. Flushing of the system is a dealer inspired refill method and I do not believe its endorsed by Hyundai.
The dealers will tell you anything, like 30,000 miles, where the real requirement may be 60,000, 100,000 or maybe never. I've not priced the transmission service charge by a dealer for the Sonata but would guess its around $150-200 or more. On my 2004 XG350, the dealer got me for $130 at 30,000 miles when the manual called for drain and fill at 105,000 miles. It doesn't hurt to change early, but why do so, when its not needed.
There is a lot on information on the forum regarding when to change, how to do it and etc. Do a search.
Last edited by Bobb4484; 12-15-2013 at 04:06 PM.