Ok everyone knows that maitenence is the best "upgrade" for you car, it keeps it healthy and maximizes the cars performance with or without mods. I am about to run upon 10k on the odo and am getting ready to change fluids: rear diff and tranny. I want to upgrade to a better protecting and more performance orientated fluids. Now here is the kicker, what to get. I am looking for a definative answer as what to get. I have heard people recommend Redline 75W90NS for the tranny and Redline 75W90 for the rear diff. The new Turbo Magazine says something about Neo Synthetic tranny fluid. Some people swear by Mobil 1 for the diff as well. I am really interested in Motul as I have heard nothing but good about them, just not sure which to get for the tranny and which for the diff or where to get them. I have done massive searches and reading but no one gives a definate answer.