last time i did it was 3 years or 120k ago...
oh and i am using synthetic tranny fluid btw.
your trans is meant to have atf in it. i've been changing the synchromesh in my isuzu every year, but i would say 3 years/120k is past time to change.
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if its still a hint of red i would. Do you know what burnt trans fluid smells like? if you do and the fluid smells bad, i would leave it be and save for a new tranny. If its not bad i would go ahead and change it. I did mine when i bought it with 148,000 miles and im pretty sure it has never been changed till i got it, still running fine at 150K *knock on wood*.
2006 Honda Civic EX Sedan AT-Galaxy Grey Metallic Pearl, 37,000 miles,Loaded with everything except Leather and Nav, Tint-5% rear, 20% front, Calipers painted Subaru WR Blue, Ipod Integration, XenonDepot 4300K HID Conversion kit, Debadged, Optima Red-Top, No performance mods because its an auto, and its under warranty.