How many miles have you guys gone until you first changed your automatic transmission fluid? Is it even necessary? If so which brands did you use and why?

 

I got a 92 sc4, I use Toyota T-IV atf. I needed 12 quarts for a decent flush and replacement, probably should have used more though to be on the safe side - I'll do it later. People will tell you I'm an idiot for doing my ATF changes every 20,000 miles, but that's what I do, I'm paranoid, and want to postpone the inevitable transmission replacement as much as possible. I'm keeping this car forever. Most people do it every 50-60,000 miles though I think. And yeah, transmission fluid change is pretty darn important.

 

WOw, only one person changed transmission fluid in here? haha