As most Ralliart/Evo owners know the fluid for the TC-SST isn't cheap but it isn't meant to be! Do it right the first time with Diaqueen and avoid other "similar" fluids. I've seen these transmissions grenade, grind, and fail due to not using the proper fluid. Never mix fluids between changes either, it can be disastrous as well. Fork out the money for Diaqueen, 400+ is better than 6,000+ for a new transmission! Stay healthy friends.