Hello all, 

I've had my 2006 Impreza for about four years now. Since I've owned it, I've gone through several headlights (about three per year; alternating passenger and driver). I also go through oil like a hole in the head, despite having all head gaskets replaced about two years ago. Additionally, my emergency brake light has not gone off in about 6 months. What gives?! Are these common problems with my make and model?

I can't address the head lights or e-brake light, but I recommend changing out your PCV valve.  Subaru Genuine only! Very common reason for using oil when you can't see leaks.