i have a 98 runner, 4cy 5 sp., 4x4. i bought it used (62k) and changed the fluids myself at about 70k. not sure if it was ever done. the fluids were rather dark, and dirty. smelled burnt. i then replaced with mobile 1 accross the boards, and change out once a year now. about every 20-25k. ever since then, it comes out almost like new. still almost see thru, and the smell is not nearly as bad. also, it is a good sign as to how frozen the plugs are as to when it was done last. but as of now, i can still see thru it as it drains. i am switching to redline mt90 next time in the tranny though. i have heard from friends that it does make the "nothciness" of the shifts better, especially when cold. just my .02 on this subject. don't be alarmed to see the metal shavings on the magnetic drain plugs. SOME are normal wear and tear.