I think it's 12 quarts total, but if you do a drain and fill by pulling the transmission pan drain plug it's only 4 quarts at a time. There's a few different methods for flushing the transmission fluid or you can do a series of drain and fills with some driving in between each one. Drain and fills won't get all the old fluid out, but if you do 4 or 5 of them there won't be much old fluid left mixed in there.I❤️4runners;3810986 said:OK, that makes sense. I know it's been a long time since it was last serviced and I just don't want to screw anything up by using the wrong or bad tranny fluid. I think I'll go ahead the Valvoline Maxlife Dex/Merc stuff. The girls got 287,000 miles on her and I don't want her to quit! Thanks for your help! Oh, one more thing, any idea how many quarts the tranny holds?