I don't know the exact material of the ADBV. But, I do know that the two black 'rubber' pieces are firm, yet highly flexible. Not flimsy, but easily able to bend in half. No plastic feeling whatsoever. I know they were sitting in oil, so this may be a no brainer, but the piece felt very moist and uncrackable.
I will let ya'll know if the oil starts staying cleaner for longer. I used to do 1000 mile OCI's with Castrol GTX 10W-30 because it was getting black very fast. Although, it got to where it'd take 1000 miles to finally start getting noticeable black. That was after 15x 1,000 OCI's. Then, I switched to RTS 5W-40, and by 500 miles, the oil was black. I understand what you say, oilyriser, and I take that into consideration when looking at oil. I wipe it on a rag, I wipe it on my finger, etc. etc., to get a good view of it.
I hope nothing bad comes from this oil cleaning my engine. It may be all that's holding it together
. Nah, but it's a 1986 5.0 that had 109,000 miles when I first got it, now I'm up to almost 124,000 miles. I haven't developed a single leak, yet, so I don't think the cleaning has done anything bad, yet.
But, the oil is very, very BLACK when I changed it. I'm hoping to see that slow down by the 4th time around of RTS 5W-40. If I do start getting some leaks, and I do mean IF, I will go to Valvoline Maxlife for a while. But, I don't want to unless I have to. I like this oil.
Oh yeah, after cutting this filter open and seeing the high quality, it must be sad for the people who cut open Fram filters and actually see cardboard for end caps. There wasn't a single piece of cardboard in this Motorcraft.
Since the oil does get black fast, cleaning up what I think the PO left behind, do you think it's a bad idea to change out soon? I think next time I'll wait at least 2000 miles to change it if it is still getting pitch black this fast. But, would it hurt to go 5-6k miles on an oil that is pitch black by 500 miles? At least no debris was in my filter, so I feel better that I can run it longer.
I think it was Overkill that took a filter apart after he had used Mobil1 and it had chunks of 'stuff' in it (debris). I figured it was from cleaning, but maybe it was a worse case.