How often do you need to change transmission fluid
Every 3 years/50,000 miles.
http://straighttalkautomotive.com/articles/transmission-flush.html
Tester
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My personal approach is every 3 years or 30k miles, whichever comes first.
Hopefully the OP’s vehicle has had the trans fluid changed 5 times over the 15 years.
Otherwise…
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I second going 3 years or 30k miles