Join Date: Feb 2011
Location: Boston, Massachusetts USA
2007 Sonata GLS
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Actually, it sounds like you received an ATF flush rather than a simple change since you said that a machine was used. A flush using a machine that connects to the AT lines replaces nearly all of the ATF while a simple drain and fill only replaces about 50% of the ATF, the ATF in the torque converter is not impacted by a drain and fill. I would ask them when you return for a ATF level check if indeed you received an ATF flush. If so you should be good to go for at least 30K miles, I wouldn't go over 50K miles between flushes though, IMHO. You can also check the ATF fluid yourself and see if it is a bright red, which would indicate a flush as compared to a duller red which would indicate a drain and fill. One other thing, make sure they used an SP-III compliant ATF, anything else can cause significant issues with your transmission.
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