I just got my oil changed at 3000 for my 06 wrx. The dealer put the little sticker to remind me i am due in another 3000. However, the manual states it should be changed every 7500 with conventional oil. So i will be going back in 7500, because it saves me money and if the manufacturer says 7500. i think its ok to trust Subaru owners manuals over a service dept. Just out of curiosity, why is the oil change interval (7500miles) so much longer than any other vehicle i've owned or heard of?