
Originally Posted by
oj88
As with anything, some works better than others.
IMO.... again, my opinion. I think the ADBV works best with the filter mounted vertically or near-vertical, with the thread at the bottom. Gravity will pull the oil down and force the ADBV closed. With the filter mounted horizontally, there's less force applied in closing the ADBV, so expect some oil to seep back out the inlet holes.
Also, oil permeates through the filter media and if you remove the filter, oil will leak out the outlet port. That's normal.
And last thing, the oil typically flows as such....
Sump > pump > filter > oil galleries > moving parts > sump
When you turn off the engine, oil left in the galleries, moving parts, and most internal engine surfaces, flows back to the sump. That's the reason you get a higher dipstick reading when the engine has not been running for a while. The "extra" oil did not all come from the oil filter.