Two things this thread shows is all dealers are totally incapable of properly doing OIL CHANGES. And also, apparently dealers are telling people that new cars burn oil. I can't believe they expect you to be okay with that kind of issue on a brand new Subaru. Actually I can.
Another thing I've learned is that they don't actually like for you to be honest on their Customer Satisfaction surveys. In my case, they no longer send them.
Subaru of America are just a bunch of lying, know-nothings who get paid to answer calls. They know absolutely nothing about the cars, and the dealers don't either. If mine was that far down after 500 miles, I'd be watching the dipstick very very regularly, and have a complaint filed. Filing a complaint would put your info into the list in case they actually decide to step up to the plate and do the right thing. I'm not holding my breath, but at least if there's a recall or something you're documented.