I think changing tranny fluid often on a highway driver is a bit of a scam.
Go down to the barber shop and ask the guys you put zillions of miles on
Electras, Fairlanes, Polaras, Cutlasses, Caprices etc how ofetn they changed
their tranny fluid....betcha once in a 100k at best.........that being said
I changed mine once in 62k on the sonata-obliged the dealer around 30k miles
on his insistence. Of course, if fluid is burnt (why is that happening),
change it. if you live atop Pikes peek, of tow a house trailer ymmv !
< flame suit on :>) >
PS Why was OP vehicle in tranny shop at 15K?? Also, if a shop said my fluid
looked bad at that mileage on a routine visit, I'd like to take a look and