I changed the fluid and filter using our signature series ATF and OEM filter and the transmission feels much better. Shifts great, I've definatly abused it a bit slamming the kickdown once in a while to rev the engine (I also use it alot to pass slow motorists). But that's just my experience doing it at 99k miles. As some of the others have mentioned if your not having issues then there's no point in messing with it. If it ain't broke don't fix it. But if you do decide to change it, we are running a sale on our synthetics
