I've been tracking down a number of low grade oil smells in the car lately (2004 Subaru WRX). So far, that has included replacing the left front axle (was losing all kinds of grease through the boot), replacing a power steering hose that had a tiny hole and fixing a slight overfill of transmission oil.
However, I still have a slight hot oil smell after driving home from work. After a little bit of under hood detective work, I see this:
That's the throttle body hose coming out of the front side of the intercooler. This is not a place that I would expect to find oil. For context, here's a larger scale picture:
So the question is: what is going on here? How did oil get on top of that hose (and on the edge of the intercooler)?