passnfast,
By letting the car sit, will not make that seal leak. The fact that the car is new, tells me there must have been a problem when it was assembled at the factory. The seal may have been cut or not pressed in all the way from the beginning. We had a lot of problems with the earlier 4L60 transmissions blowing out the front seals when the trans. got hot, but they fixed that problem long since. I'd have to say, if a reputable dealer repaired your car, you should be good to go and have no more problems with it. Ken
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