"Ultra" as in Fram, or AC Delco?
The Fram Ultra (99% @ 20μ). I use to use ACDelco UltraGuard om my Z06 when they first came out, but I think they aren't as efficient now as they were then back around 2005.
I forgot to address this in the last reply. Do you think the tearing issues were related to extended OCIs where the media loads up and the added stress rips it? Have they fixed this issue? Did the H+M takeover reduce efficiency to address this?
The root cause was not caused by extended OCIs because most of the reported torn filters were not used beyond the recommend period. There were even a few that showed tears with less than 2000 miles IIRC. And certain filter models seemed to be more susceptible to tearing, it wasn't across the whole line. Did you ever cut any of your used P1s open to inspect?
Have you seen the cutaway of the Boss? Looks like it would hold more particles more securely with the sandwiched media?
I have cut them open in the past, not done that in some time, don't remember seeing any tearing. The old yellow P1s that Advance Auto is sending me for PL24011 has me worried that the media might be aged. It is synthetic blend, maybe the cellulose portion could be suspect?
The Boss nylon mess (I believe) backed synthetic media, so it shouldn't have any issues. I don't recall seeing any Boss filters being torn, no surprise with the mentioned construction. However, the Boss isn't as efficient (99% @ 25u, which isn't too bad) if that's something you're after.
Here's a spreadsheet member Stu_rock (IIFC) made up when all the tearing was going on. I see only one 24011 (on line 46) in the list, so either not many people used and cut those filters, or they weren't; susceptible to tearing. Link ---> Torn Filter Spreadsheet
Yes, it is nylon mesh, I found a video of one cut open, from the advertisement I thought it was more filter media.
I'm reading the footnotes: the asterisk is for the "Ideal Oil Match" and the cross is for "Dirt Holding Capacity". So the way I read the cross footnote is the L and PL models can hold the stated amount of dirt at 20 microns, and The PBL can hold 27g at 25 microns. The "Dirt Removal Power" just has "TM" (Trademark). It does say 99+ for the PBL, but doesn't give a micron level.The PureOne isn't rated at 99.9% @ 20u anymore - it's 99% @ 20u. I went to the Ultra (wired backed media) many years ago because Purolator had media tearing issues.
https://user-yckgqj.cld.bz/Purolator-2019-Master-Brochure
Thank you for finding and posting this, however the spreadsheet only shows "Failed Engine Oil Filters", a majority of them failure not specified, and those that were specified were mostly ADBV issues. Only a few had media tearing issues. The two that collapsed were cartridge filters, possibly the vehicle's bypass not working?
The holding capacity and "at 25 microns" are not related - I think that's a typo by Purolator. The footnote in the chart in post #3 is really saying that the Boss (ie, PLB) is 99+% efficient at 25 microns. Look closely at the same Purolator info in the link below ... you can see the footnote asterix next to the "TM" in the "Dirt Removal Power" (ie, efficiency" info row). Also see post #16 below.
The filters that have no notes in column K were torn. Believe me, the majority of those filters listed are there because of media tears. You can go back and find every posted torn filter thread if you want to go back and search the board around the 2014-2016 time frame.
Thank you for the research, these are current (2021) specs, the one I saw apparently was older, I presume. So they tested only one size, 30001, with the ISO 4548-12 and extrapolated those results across all sizes?
So the 2 yellow filters I received in size PL24011 mfg. 09/23/15 are probably suspect? Advance Auto is still shipping these from their Bakersfield warehouse. I see from your thread from 10/03/14 the ones to avoid are dated 06/12 to 11/14. Btw, I printed that table way back and use it for reference when I order filters. If it was your post, a belated thank you!! You think I should attempt to swap them out for newer versions? The PL22500 I also received are dated 02/29/20, must be a more popular size.
I just realized that most GM (correct me if I'm wrong) have the bypass valve in the filter mounting base. The PL 24011 has no built-in bypass valve could this be a cause of tearing? I have not heard of a valve sticking closed, but I have had one that was not working. The plate was no longer securely mounted, and had minimal spring pressure. I got a new one, spring pressure way stronger. This in a 3.1 V6 Camaro, I had to take the motor mount off to swap out the mount plate, IIRC.
AH HA!!!!! I found it!! It is in an Amazon description, don't know how old, but this is where I got that information.
