tansmission fluid on 1993 Mercury Sable

the car has done this tthree times on a trip of about 30 miles the car will loose the transmission fluid when it seems to be hot. took it to a mechanic and he found nothing i always have to put two quarts of oil in it can someone tell me what is going on

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1 answer
Some transmissions have a vent tube. There may be a problem with the transmission not being able to vent which builds up pressure causing fluid to be pushed out.