I own a 03 WRX and am coming up on 3000 miles and my first oil change. My dealer told me when I bought the car not to use synthetic oil until closer to 10,000 miles. That sounded kinda odd to me because I have always run synthetic in my cars. I understand that you shouldn't when the car is brand new so the rings will seat, but after 3000 and a full break in bu 1500 they should be seated. Are there any adverse affects of switching to synthetic right now, and what do you recommend for the Suby.