If your oil filter mounts inlet/outlet side up,an ADBV is probably irrelevant,right? I think an Orange Can is going to be my next filter.
That is correct .
The rest of the oil will eventually drain out of the oil passages past the crankshaft bearings and back into the sump .
If the oil filter is inverted or sits sideways the ADBV might retain some oil in the filter if it seals properly .
Read the part in the first post about the test I did on the ADBV. It held oil in the filter for a week. If the ADBV seals as it should, no oil will leak out of the filter back to the sump.
ADBV Test
And it has been shown that even with filters that mount vertical with base up, the ADBV can also prevent oil from flowing back to the sump depending on exactly where the oil filter is mounted with respect to the oil level in the sump. If the ADBV is above the sump's oil level, then it can prevent oil back flowing to achieve the same level as the sump due to gravity.