Something that hasn't been brought up that I wanted to ask, specifically since you're in the NE like me- were you using 0w-20 oil? Or had you gravitated towards something heavier? I've seen a few oiling issues here in VT from WRX/STI owners who listen to forum posts about needing to use something absurd like 15w-40. The people suggesting it don't mention that they're suggesting its use in 90f temperatures. The fools keep this sludge in their car on -25f days, go screaming on the highway and wonder why they're plagued with oiling problems.
Just asking, since I'm curious. I'm in no way suggesting you're running diesel oil, I really just an asking to know