So when it comes to oil filters, how is the dirt holding capacity defined ? It is normally stated as grams, but in my head I was thinking that volume would be a better performance metric. Can somebody clarify what this means ? Grams of iron, aluminum, silicon, feathers, weed ? Or is my confusion between mass and volume irrelevant.
Oil filter " grams holding capacity" definition?
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This answers some of my questions, but I was looking for a more precise definition for "grams holding capacity"- does the ISO standard define the "test dust" ?
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4299232/1
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4299232/1
There will be some blowhard filter guys telling you that their favorite filter holds xx grams of snot. I don't know what thats worth, or what you're really looking for. I maintain my vehicles well so I've never been overly concerned with how much snot it holds. My engine shouldn't have that much snot.
They use a very specific test dust and the sizes are specified in the ISO procedures I believe they vary between different sizes of 5 micron increments such as 5, 10, 15, 20 and possibly 25
I have seen the sizes somewhere but can't recall exactly because I don't have the official copy of the test procedures
It doesn't matter if it's a gram of dust or gram of aluminum because it's a controlled test so you can compare apples to apples. There is obviously a difference between 5 micron dust particles and 25 micron wear metal particles so the filter may actually hold more metal than dust because the large particles will be stuck on the outside of the media in the pleats and the smaller wear particles will flow through the pores further into the depth of the media like the test dust would
I have seen the sizes somewhere but can't recall exactly because I don't have the official copy of the test procedures
It doesn't matter if it's a gram of dust or gram of aluminum because it's a controlled test so you can compare apples to apples. There is obviously a difference between 5 micron dust particles and 25 micron wear metal particles so the filter may actually hold more metal than dust because the large particles will be stuck on the outside of the media in the pleats and the smaller wear particles will flow through the pores further into the depth of the media like the test dust would
Grams vs volume is a good insight OP.
Yes the ISO standard uses standardized dust made up of defined quantities of different size particles
Yes the ISO standard uses standardized dust made up of defined quantities of different size particles
Originally Posted By: bvance554
There will be some blowhard filter guys telling you that their favorite filter holds xx grams of snot. I don't know what thats worth, or what you're really looking for. I maintain my vehicles well so I've never been overly concerned with how much snot it holds. My engine shouldn't have that much snot.
And that thought (minus the snot word) pretty much aligns with what highly respected member Jim Allen posted about filter capacity before he stopped posting. He posted HERE that:
"....the average filter in the average car at the average OCI/FCI is less than 50% loaded when removed. Doesn't apply to everyone, of course, but i you have your inputs under control (mainly a good air filter) then you should fit at or below that average...."
Back when Purolator posted their 13g spec for the P1, general consensus back then was that if your engine is producing 13 grams of garbage/(snot) over the course of an oci/fci, you've got much greater engine issues than the holding capacity of the filter. I happen to agree with that thought, and even 13g quoted is a lot of junk.
I'm sure most frequenting this site maintain their engines well, as do I. In that case while having a great big fat holding capacity number out there can give warm fuzzies, in all likelihood it won't come close to being approached in their engines. So much like filter flow in PC use, I don't concern myself much with the holding capacity spec in the vehicles I maintain. It's a nice figure to know, but not something those with well maintained engines need be very concerned about, imo.
As reference, the quoted Jim Allen is the member with the sticky at the top of this subforum with his work on bypass frequency. And his findings basically agreed with the general consensus idea that bypass is a relatively infrequent and short duration event.
There will be some blowhard filter guys telling you that their favorite filter holds xx grams of snot. I don't know what thats worth, or what you're really looking for. I maintain my vehicles well so I've never been overly concerned with how much snot it holds. My engine shouldn't have that much snot.
And that thought (minus the snot word) pretty much aligns with what highly respected member Jim Allen posted about filter capacity before he stopped posting. He posted HERE that:
"....the average filter in the average car at the average OCI/FCI is less than 50% loaded when removed. Doesn't apply to everyone, of course, but i you have your inputs under control (mainly a good air filter) then you should fit at or below that average...."
Back when Purolator posted their 13g spec for the P1, general consensus back then was that if your engine is producing 13 grams of garbage/(snot) over the course of an oci/fci, you've got much greater engine issues than the holding capacity of the filter. I happen to agree with that thought, and even 13g quoted is a lot of junk.
I'm sure most frequenting this site maintain their engines well, as do I. In that case while having a great big fat holding capacity number out there can give warm fuzzies, in all likelihood it won't come close to being approached in their engines. So much like filter flow in PC use, I don't concern myself much with the holding capacity spec in the vehicles I maintain. It's a nice figure to know, but not something those with well maintained engines need be very concerned about, imo.
As reference, the quoted Jim Allen is the member with the sticky at the top of this subforum with his work on bypass frequency. And his findings basically agreed with the general consensus idea that bypass is a relatively infrequent and short duration event.
Good answers all, thanks for the input.
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