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It does when it allows oil to drain back, emptying the oil passages and presenting less resistance on startup.

Only 3 of 10 have been confirmed to leak so far, although I suppose 'only' is a strange word choice in that context... This is a rubber-metal interface. If air leaks at this rate, oil will absolutely leak too. With how this style of ADBV works, higher pressure should improve the sealing (in a...

PSI is a bit hard to say, since my regulator lowers flow rate when the pressure is lowered, so if there was a big enough leak in the ADBV, pretty much no internal pressure could build with a lower regulator pressure. That said, I went ahead and tested them all by applying 13 psi for 5 seconds...

Might be if the rest of the filter is pretty much identical. Although I'm more curious about the impact on the ADBVs. Testing those now, and the first XG was leaking badly.

It will leak with either, especially considering the rate you see there.

It leaks at all pressures I tested, even very low ones. I turned it up a bit so it would be more apparent for the video, but increased pressure (up to a point) should make this type of ADBV seal better, if anything.

Two brand new XG3600s, from the same store, with the same date code. In case it's not clear in the video, the first is leaking heavily from the inlet holes.

So what's the progression? Holes + wire backing -> Holes w/o wire backing -> Louvers?

Quick note on the FE tests. I just noticed that FE3600 #2 has longer slots in the central core than 1 and 3. The slots on 2 are more like those found on the XG and FS filters I have. This could be contributing to the difference in pressure differentials. This next batch is interesting. These...

You would have the same variability in media regardless of leaks. The assumption of media consistency is unfortunately necessary. If one of these filters happened to have a tear in it and came in at half the pressure differential compared to the others, you aren't going to come back with...

All you had to do was make it to the end of the sentence lol. Surely you can at least agree that less leaking is better than more leaking?

It's enough for me. Unless my understanding of things changes before my next oil change (or unless I can find some of those OG Titaniums), I'll be going with a different filter. Also, I just realized I had a fourth XG3600. This one is from RockAuto, while the others were from Walmart. It has...

I just made mention of this in another thread, but I think it's more relevant here. Looking at that graph, it really seems like the Wix may have been a leaker.

Bypass leaking has at least two effects. First, it lowers the efficiency of the filter at all particle sizes by an amount that is proportional to the fraction of flow that goes through the leaks. Importantly, that means there is no longer any ~100% filtration rate for a reasonable particle size...

I should have included that, will do when I summarize everything. The FEs sit between about 10.5-11.5 kPa, while the XGs are 12-13 kPa. So the XGs are more restrictive to air, but I don't know if that ranking would definitely remain when using oil.

The full codes for the FEs are 23178AF, 23022AF, and 23178AF. The XGs below all start with A though. Also, oil tests are next! Just want to complete all of the vacuum tests first. Here are three XG3600s, with the same method as above. Filter 1 is red, filter 2 green, and filter 3 blue. Dates...

Oh, almost forgot dates! Filter 1: 2023, 178th day Filter 2: 2023, 022nd day Filter 3: 2023, 178th day Interesting that filters 1 and 3 were made on the same day and have nearly identical results, while the older filter 2 performed worse. There were no visible differences in the construction...

Alright, first results are in. There will be more to come though. Three FE3600s were measured for differential pressure across the filter media and bypass. The first is marked in red, the second in green, and the third in blue. Three measurements were taken of each, and then the first one was...

You would have to destroy a filter every batch to get a new baseline. Unless you can keep all significant variables static, this test weeks from now has no meaningful comparison to this test today. The baseline is useless for non-destructive testing like this, and arguing against a necessarily...

You'd have to destroy one filter every time. It's a completely different scenario. The title of the thread is non-destructive for a reason. If you are going to be opening filters, then there are many better ways to test things like this (like, just looking at the filter lol). I think it would...