I have a 1995 E300 Diesel...& am unsure how to clean those port holes/channel on the Oil Filter Bolt(tube) that is supposedly easily cleanable with compressed air.


Ive searched the discussions, am unable to find anything real helpful.

There is a real slow oil sludge that flows out of the bottom of the port hole when I hold this Oil Filter bolt upright, I am unable to clean those holes or channel - they stay dark colored & seem about 90% clogged.

I tried blowing air thru the top hole down the bottom port hole with a bicycle pump, also by my mouth(with assistance of clean rag) but was unable to blow any air thru.

Maybe I should shoot WD-40 down the top hole, maybe run hot water thru the top hole for 20 minutes or so, maybe take this thing to Sears & borrow their compressed air, maybe try shooting gunk oil cleaner & soaking the tube in that stuff overnight, Im open to suggestions