I usually drive my car less than 10 miles a week. I bought my '04 WRX Wagon on 9/11/03. It currently has 3102 miles on it. The longest drives I have had are a couple from Philly to DC and from Philly to the Pocono mountains. My drive to work is 3/4 of a mile - one way. I usually let the car idle for about 4-5 minutes before I leave the drive way, and when I get to work, I idle it another 1 minute to make sure I try and shut it off when it has hit normal operating temperature.
When the weather warms up, I will walk to work, as it doesn't pay to drive. My first oil change was at the dealer on 12/11/03 at 2131 miles. I plan to do another oil change on 3/11/04 or so. I used to use M1 20W-50 in my '93 RX-7, exclusively. However, that was when I lived in South Florida, and the car had extensive track time (Sebring, Homestead, VIR, Summit Point). This car is a daily, or lack of a daily driver. So, I do have experience with synthetics. Should I continue going by a 3 month interval if I switch to synthetics? Could I go by a 4, 5, or 6 month interval if I switch over? I know if I continue on "dino"saur oil I will definitely stick with 3 month intervals on my oil changes.