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Originally Posted by oldjeep
If you just drained through the plug, you missed about 1/2 the fluid. To properly change the fluid in any automatic transmission you have to hook it up to a fluid replacement machine. According to the Factory service manual, that transmission holds 10.5 quarts of ATF
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I agree.
You shouldn't just "drain" the fluid, you should "flush" the whole tranny including the Torque Converter, if you just drain and refill you don't get all the possible contaminants out. Sort of like taking a shower and putting on dirty underwear!

If you plan on keeping your Sorento for many years "flush" the tranny system every 25-30,000 miles.
Friend of mine owns a tranny shop and that's what he does to all his personal automatics.