helixthecat

Dang, I was afraid of that. I've been using Mobil One/75-90 for the last year and a half. Thanks for the replies, I really appreciate them.

I have a 2000 Legacy, 120,000 miles, 5sp manual transmission. Lately the transmission has been jumping out of 5th gear. The car shifts perfectly, no grinding, noise , difficulty changing gears or metal in the fluid. For the first 15 minutes or so after starting cold, the gear shift feels solid, but then it becomes all rubbery with noticeable movement in all gears and that's when it pops out of 5th every 10 or 15 miles on the highway(55-70 MPH.) The pitching stopper is tight. I'm considering an STI transmission mount, the stock one looks and feels like two gum erasers in a frame. Any ideas? I'm afraid it may be the mainshaft.