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Fair enough. I'm curious where the disagreements stem from though. I think it's pretty clear that there is fiberglass media shedding that enters the oil. I supposed the question is just how much damage, if any, that could cause.

I think you are forgetting the context of this post, which is non-destructive testing. Obviously you can do a lot more with destructive testing, but then that would be a different topic. I'm guessing that's why you are under the impression that I'm not understanding you. What is being compared...

I said a few things in that post. Which one specifically are you claiming is untrue?

A bad one would have a significantly lower pressure on the output compared to the others. It is a relative comparison, with the assumption that not all of them are bad. This isn't to test if a leak exists, but to compare the magnitude of any leaks present. By creating an increased restriction...

Cotton and polymers used in synthetic filters are pretty soft materials. I think damage from them could only really start to happen if it got to the point where there was clogging, which would require a lot more material that you would see from media shedding. Glass on the other hand is very...

I actually missed the Zoom meeting unfortunately, but good timing! Thank you for sharing those slides. I started looking into micro fiber type filters since doing this, and contacted Donaldson and Fleetmaster. Donaldson didn't really answer any of my questions and just told me they don't sell to...

I do get it, the comment was (mostly) a joke. Obviously none of those places vacuum an oil filter to clean it. You seem to be getting quite agitated over this, and I'm not sure why. I think I have fully demonstrated that there is debris from new oil filters that will enter your engine. The...

So you can identify an especially bad one. I don't think there's a good non-destructive test to quantify the severity of the bypass leaks we've seen. Testing like this would let you know if a filter has a tear or an especially bad bypass leak. It also puts some mild stress on the filter element...

Under the magnification of this one, the entire field of view is ~1.85 mm. I tried transferring the debris to a piece of tape, so the smaller stuff is a bit more visible. *edit* Wow that didn't survive image compression somewhere along the way lol. The large one is 95 microns, the medium is 38...

Reason #37 not to go to those places? Unfortunately the smaller stuff isn't going to be captured well by an old t-shirt lol. But the smaller strand at the end is around 20 microns. There were plenty of them, it's just a bit harder to image them, especially since I don't want to cut the shirt up.

Damage isn't usually catastrophic or nothing. We use good oil and filters to reduce wear, not eliminate it. If media shedding turns out to be an actual contributor to wear and if it can be minimized by taking 10 seconds to vacuum it out (or if it suggests using a different media type), then why not?

Again, the goal isn't to try and quantify the difference between a leaking filter and a non-leaking filter, it is to compare a batch of the same model of filters. If a non-leaking baseline was wanted, it would be simple enough to cut one open, check for tears, seal the bypass, and then tape it...

Walmart, AAP, and RockAuto.

Yea I was surprised by the amount of larger debris that came out. And yup, that's how it was setup.

With synthetic media filters often containing fiberglass, I started wondering about media shedding into the oil. I did a quick test with some Fram filters. I attached a vacuum to the outlet of the filters with a ~1 psi differential and a t-shirt to catch debris. Results were interesting, and I...

I'm thinking there there might be some misunderstanding of the purpose of a test like this. It is not to compare some random filter to a known good filter, it is to compare a batch of filters of the same model to identify differences in the amount of leakage present. The one assumption it really...

1-Efficiency*PercentFiltered. So 1-.7 for the first filter, and 1-.9*.85 for the second filter. So the breakeven point between a normal and a leaky filter would be the particle size at which EfficiencySealed = EfficiencyLeaky * PercentFiltered. Taking a look at Ascent's chart, the OG Fram...

I don't think that's an accurate assessment. With a lot of simplifications, you can go a bit further into the math. For a given particle size, if we say filter 1 is 70% efficient per pass and has no leaks, while filter 2 is 90% efficient per pass (for the filtered portion) and has a 15%...

I guess these days it might actually be optimistic to expect at least 1/3 to not leak...

Yea there's no way this would work for comparing models, only for comparing a group of the same model. If you picked up 3 filters of the same model, for example, I think it's a workable assumption to consider the restriction from the media to be roughly equivalent among them. A difference in...