I am about to change the tranny fluid and filter on my 2000 MPVand I would like to know ifthere a better grade of trans fluid - ATF M-III to put intoit? and what is the equilenet to the recomened fluid MERCON III? DEXTRON ? sorta con fused here although some one told me there are only 3 types of fluid for auto trans but there are alot of brands. Thanks