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You can search for the few times people have reached out to them. Eg: https://bobistheoilguy.com/forums/threads/efficiency-of-mahle-filters.323446/post-5364407

Many ceramic pads have higher friction ratings than semi metallic and most cars braking is limited by the tires. So while I don't disagree with you, what exactly do you mean by performance? The initial bite and the feel or something else?

Surface area is better than pleat count but even then, it's not taking into account media depth and type. The best air filters are a very fine synthetic depth media that can filter very well with low restriction and high dust holding. What I would like to see Brand Ranks test would be the...

Tired of cutting corners, the US oil filter manufacturers are now cutting circles.

European filters: Well made, high holding, low efficiency.

Agree with Fram then Purolator. The rest are all very bad. If I had to rank them they are all equal last.

That's the max particle count recorded at any time during the test. Look at the area under the curve to get an idea of how many particles get through in the lifetime of the filter. I clipped a picture of the non compressed Wix graphic in an earlier post for precisely that reason...

Disagree. It looks like it has terrible filtering for a third to half it's life. Might even be the worst one.

I got a Canon laser printer / scanner / fax about 10 years ago for $100 and it came with an extra Canon cartridge. Sold the cartridge for $75. 4 years later, the starter cartridge ran out. Bought a 2 pack non genuine from Amazon for $25. Still using the first one. For low usage, laser is the...

I think people here are mostly asking for specifications (efficiency mostly) and the fact is that efficiency is low on the list of priorities, let alone answering individual requests for it. I'd be pretty certain that PG nor their suppliers are testing filters for efficiency once they've...

Fram is best followed by Purolator. None of the others seem to be worth buying. If the Fram Ultra air filter from Walmart is better (as Fram claim it is) vs the Fram basic filter tested here, then that is clearly the best buy on efficiency and longevity and price. Just need to examine it to...

There are 2 independent tests of oil filter restriction for Fram and PG that I am aware of: 1) 2021 Ascent Filter testing. At 22.5lpm / 5.94gpm a) Fram Ultra OG: 3.38psi b) Royal Purple: 4.38psi 2) 2023 Brand Ranks: At 6gpm a) STP XL: ~3.5psi b) Fram Ultra (First Brands): 4psi c) Fram...

They used medium test dust (as they did with the oil filter testing). I believe they should have used coarse test dust. This could skew the results and make more efficient filters last less long than the real world, while making less efficient filters seem worse than they would be in the real...

Not that it matters that much but once they get to Purolator and onwards, the max particle numbers they give do not match the y axis. In terms of whether they stopped recording data for the Wix, it wouldn't make sense since they tested each filter to capacity and likely used the same filter for...

Any chance you can do this test under the same conditions with the Carquest and one of each of the Frams to see what the difference is? At the moment, it is suggesting that a properly manufactured Carquest has less resistance than a leaky Fram. As mentioned earlier, in the Fram, we are looking...

To summarize; 1) 4 Ultras manufactured 2024 have an average of a Bad rim seal / adbv leaking (1 Medium RS, 1 Very Bad ADBV, 2 Bad RS) 2) 2 Titaniums manufactured 2024 both have a Bad seam leak 3) 1 Titanium manufactured Jan 2023 has a Minor seam leak 4) 3 Champ 2023 manufactured Endurance...

There are a few instances on this website, from many years ago, when Ecoguard and Premium Guard did respond. But they seem to have become much too big for that now.

I'm just basing it on what I've seen Wix and Mahle say (which I might assume you would want to exceed as with multipass efficiency :D?)

^ Filter wrench recommended for removal only.

Anything on the box you saw in store about the efficiency rating?