noticed that i have oil in Air Cleaner-to Intake Tube don't know if that is normal or not but I thought it was a valve stem valve but looked into it and it doesn't have a valve. the oil level tends to go down quite fast but no leaks under the car or weird color smoke either. it is a 2006 chevy cobalt 2.2 manual trans.
It is normal to have a little bit of oil because the intake produces a vacuum with a line going directly to the valve cover. Don't know how much you have in there but not rare to see a spoonful accumulate. How often do you change the oil? Conventional or synthetic?
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