I just got my 2004 WRX and I have to say I love this car!! I've been told to put only synthetic oil in this car and I did so today using Mobil 1. I wanted to know if its true that you can change this oil every 7500 miles?? I heard that ppl that use synthetic oil still do every 3000 miles too. Just wanted to know what would be better or maybe what most of you on here would rather do. Thanks!