Change fluid every 40k I'd suggest. Here is the link to the cocktail. I suggest Mobil 1 w/ 2 oz. of the friction modifier.

http://www.contour.org/FAQ/FAQ.php?s=probs&displayid=22

-'96 SE MTX 3L -'98 SVT 1,173 of 6,535 -'05 Mazda 6s, loaded, g/f's ride -Need a 96-00 manual on CD? PM or email me