That 99% @ 23 microns is based on a 51515xp, it's on the Wix website.
New Wix XP
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I don't see any efficiency or beta ratio info for the Wix 51515XP on their website. That's because it's "proprietary".
Where are you seeing this "99% @ 23u" claim?Link to the 51515XP data page on Wix's website - LINK
There seems to be many claims online for WIX XP oil filters that says:
Not sure where that is coming from... Oreilly's says below...
https://www.oreillyauto.com/detail/...e/49064cb5eedc/wix-xp-oil-filter/wixx/51515xp
99 percent efficient at 35 microns (Based on 51515XP, 51356XP and 57060XP).
- ADVANCED FILTRATION EFFICIENCY: Next-gen synthetic-blended media with natural fibers eliminates the need for wire backing. 99% effIcient at 23 microns (based on 51515XP)
Not sure where that is coming from... Oreilly's says below...
https://www.oreillyauto.com/detail/...e/49064cb5eedc/wix-xp-oil-filter/wixx/51515xp
99 percent efficient at 35 microns (Based on 51515XP, 51356XP and 57060XP).
Found it!I don't see any efficiency or beta ratio info for the Wix 51515XP on their website. That's because it's "proprietary".
Link to the 51515XP data page on Wix's website - LINK
https://www.wixfilters.com/en-us/pr...ght-truck/oil-filters/wix-xp-oil-filters.html
I'll be contacting Wix Tech Dept to verify, lol. Don't believe it unless M+H totally changed the media after acquiring Wix.
They have been changing the media. It's their new "Resin" cellulose/micro glass (Syn blend) type they're switching over to now for the XP line. I'm sure you'll let us know what you hear if anything.
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I thought the original which was full synthetic and not synthetic blend?I don't see any efficiency or beta ratio info for the Wix 51515XP on their website. That's because it's "proprietary".
Link to the 51515XP data page on Wix's website - LINK
I think the Wix XP use to be a full synthetic media, with backing (metal or nylon mesh, don't recall exactly). Maybe they were tired of telling people that the 50% @ 20u efficiency was "proprietary". I'll never forget that phone call I made to Wix and that's what the Tech Dept told me.
Wonder if this Wix 51515 they ISO 4548-12 tested was this new media?They have been changing the media. It's their new "Resin" cellulose/micro glass (Syn blend) type they're switching over to now for the XP line. I'm sure you'll let us know what you hear if anything.
The ISO 4548-12 came in at 78% @ 20u. This ISO testing in a certified lab was done in early 2025.
Look at how much efficiency these filters lost as they loaded up. The worst ones are big time debris shedders ... they can't retain already captured debris very well.
https://www.kitplanes.com/oil-filter-testing
Here's what the efficiency would have to be at the end of the test run when they were loaded to give 8 PSI dP over the new filter. The Wix 51515 (is this the "new Wix media", lol) would be running around 64% @ 20u and the Champion would be running around 12% efficiency at 20u in the loaded state. The Champion is a shedding monster, lol.
https://www.kitplanes.com/oil-filter-testing
Here's what the efficiency would have to be at the end of the test run when they were loaded to give 8 PSI dP over the new filter. The Wix 51515 (is this the "new Wix media", lol) would be running around 64% @ 20u and the Champion would be running around 12% efficiency at 20u in the loaded state. The Champion is a shedding monster, lol.
So it's basically a cellulose filter with added micro glass that holds it together for strength so it doesn't need a backing. Doesn't sound too special to me. It's not that it has glass media filtering.
Far as I know this newer efficiency claim 23um is on the XP & not the regular (Standard) WIX filter. The one in that link being the standard one I don't think it will compare. From WIX website they're stating the new "Resin" media eliminates the reinforced media backing while keeping a 20k mile claim. Will it eventually go to the standard line? I don't think so.Wonder if this Wix 51515 they ISO 4548-12 tested was this new media?
Look at how much efficiency these filters lost as they loaded up. The worst ones are big time debris shedders ... they can't retain already captured debris very well.
https://www.kitplanes.com/oil-filter-testing
Here's what the efficiency would have to be at the end of the test run when they were loaded to give 8 PSI dP over the new filter. The Wix 51515 (is this the "new Wix media", lol) would be running around 64% @ 20u and the Champion would be running around 12% efficiency at 20u in the loaded state. The Champion is a shedding monster, lol.
Yeah, that's the standard Wix, which use to be more efficient than the XP. 78% @ 20u isn't that hot either for that standard Wix.Far as I know this newer efficiency claim 23um is on the XP & not the regular (Standard) WIX filter. The one in that link being the standard one I don't think it will compare. From WIX website they're stating the new "Resin" media eliminates the reinforced media backing while keeping a 20k mile claim. Will it eventually go to the standard line? I don't think so.
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So we got a new Mobil oil filter and a new Wix Xp oil filter for 2026
They took a four dollar filter and put a wix label on it, Im done with Wix...
The label was probably 1/4 of the cost.
"10 years in the making"
Indeed"10 years in the making"
