I have a heavily autocrossed (Autox'ed since 2002, 2 drivers each in STS and STX at Nat's last year, 9th in STS) 2001 Impreza 2.5rs 5mt and use Motul Gear 300 in the trans and Redline 75w90 in the rear diff. (since approx 15,000 miles) I recently changed out the Motul after approx 50,000 miles...