OIL in my Air Cleaner...?

Ok, don't even get me started on the K & N vs. OEM...Today I went to change my air filter and discovered my air cleaner housing covered in soot and oil with a small puddle of oil sitting in the bottom! The I discovered that it must have something to do with the fact that the big hose coming from the valve cover was sticking into the air cleaner housing but had come disconnected from the tube sticking up in the middle of the aier cleaner housing!!!
So I cleaned it up a bit, threw my new air cleaner in, made sure that the breather tube was in place, and got out! Will I be experiencing better performance or gas mileage?