Personally, I wouldn't worry about it. I've run plain ol' type F in mine forever, in 11-8 second cars, freshen trans evry 200 runs or so, and have never seen any significant wear. A buddy of mine runs dexron with same results. He's tried synthetics, but didn't notice any wear or performance improvements. If you have a high horespower turbo car, or a combo that really smokes the fluid, then hydraulic oil might be the way to go. For the rest of us, it's much "to-do" over nothin' or just a good way to spend more money IMO.........