pull the oil hose off of the aux oiler and blow into it, if the oil in the hose does not come out into the bar/chain, you may have a piece of sawdust plugging the small hole in the bolt on the bar. Mine gets plugged up every so often; when everything is fine, the oil still comes out slow though.
Yes, your nose oil bottle needs to vent. Here is what I used for my nose oil bottle for venting, and I don't get any wood chips-dust in the bottle. It's a bronze filter that is threaded for 1/4" pipe. They can be purchased at any bearing supply house for $.50 each. When I made the nose oil bottle, I tapped the bung for 3/4" pipe. I then drilled and tapped the PVC plug for 1/4" pipe and used the bronze filter. Works real nice.
Mine kept plugging i had chips in my oil jug . Now i use the paint strainer funnel things that are free at paint stores . now she dumps like crazy gotta come up with some kind of restriction, just never ending. peanut oil works better than canola oil i believe .