Originally Posted by mmarine58
I have an 05 grand Cherokee, love the truck. Today i was looking at the air box and i came across a thin hose that is connected to the side of the box, I opened it and there was oil in it. I'm wondering if this is normal or something is up? Much help would be appreciated!
I believe that it is the makeup air line to the crankcase (replaces air sucked out by PCV valve). On my '08 5.7L HEMI, it goes from the air box to the side of the oil fill tube. No, it should NOT have any oil in it.
This is likely an indication that your PCV valve is not functioning correctly, i.e., not pulling a vacuum in the crankcase. If you have not changed the PCV valve within the last 60K miles, it's probably time. On the HEMI, pull the valve (1/4 turn counter-clockwise and lift out) to verify it is internally clean and that the valve assembly "rattles" when shaken. After a while, the internal spring probably relaxes and the valve doesn't function correctly. The other engines tend to have them on the driver's side rear and just pull out.
I try to inspect mine every other oil change or when I empty the oil catch can.
They are $25-$30 for the HEMI (and much cheaper for the other engines), depending on where you buy. Should be a 15-min. fix.