For the ATF: i changed the fluid (drain x 4, refill x 4) this spring - the first 2 drain and refill just use regular dex3 - highly good fluid. next 2 i used Valvoline ATF that comes in a red jug for 15.50 at Walmart - this is a synthetic fluid, for extra goodness. I did this for the 2008 impreza, and the 1999 legacy. both vehicles are shifting still like brand new. the fluid change was done 6 months ago and both vehicles have been used lots.