I remember seeing a study where the minimum lifespan of Nitrile and Silicone ADBV was 200 and 650 hours of run tine if I recall correctly. Can anyone point me to it? I can't locate it.
When a nitrile anti-drainback valve hardens, it typically hardens in the exact shape of the surface it's sealing, so it still accomplishes its task.
Could it be here ?I'm fairly certain I saw one a decade or so back. But apparently I can't locate it now.
I'm thinking it was on one of the filter manufacturers sites but if so it appears it's been taken down through the years. I almost want to say it was Wix but they have never been a huge proponent of Silicone.
I know it’s near - heresy, but Wix has been on my “I’d rather not use em” list for decades. I know they’re generally well made and QC’d (and there’s actually one working just fine on my truck right now,) but they’re the one brand where I’ve repeatedly had drainback issues over the years. I was on a forum recently where a guy was ready to pull out a newly built engine (big block Mopar) and haul it back to his engine builder because every morning it had lifter rattle. Exactly what I’ve observed on my big Mopars with Wix filters. Without even getting into brands, I suggested he simply change oil filters because he might have a randomly bad ADBV, and he basically said “Unlikely, I’m using a WIX!!” I suggested he had a max of $15 to lose and a whole lot to save. Meanwhile the rest of the forum was suggesting everything from bent pushrods to incorrect rockers to collapsed lifters to a failing flat-tappet cam, to a thousand other expensive things. He tried a filter I recommended with a silicone ADBV, and it’s still quiet a month later.
View attachment 27101this filter was used after one year and 3k miles. ADBV Still flexible. Anyone got any that ran longer?