Looks like i have developed the infamous 4th gear grind. I have been running "Amsoil Severe Gear Oil" for the past 16,000 miles without any problems now that the car has a total of about 30,000 miles.
The gears usually grind when i upshift from 3rd to 4th after 4000 Rpms. It is not a grind that can be heard inside the car...but i can definatley feel it on the shifter. The problem is not there when i double clutch it into 4th or if i wait a tad bit longer in neutral before going into fourth.
My Current plan is to drain out the AMSOIL Severe Gear Oil and switch it back to regular dino Valvoline 75W-90 with a quart of Penzoil Syncromesh....
Another alternative could be to take it to the dealer and get it warrantied....now my search on CLUB WRX has shown mostly positive results from the dealer about the 4th gear grind but my search on NASIOC mostly came up with abuse excuses to deny the warranty claim for the 4th gear grind.