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Does The Boss have the same ruffles disease that Fram filters have? From https://bobistheoilguy.com/forums/threads/purolator-pbl-24651-cut-open.365655/ :

I have sent a letter to the president of Mann+Hummel asking which efficiency numbers are the correct ones for the Boss. I will let you know what the response is.

Thanks for your response. I think I looked at all of the recent C&Ps of the Boss, and the impression I came away with was mostly praise for how well built they are and how their media is impossible to tear. That is why I was interested in the pics you posted which appeared to throw doubt on...

Corrections: There is no conflicting information. Purolator's claim is not "a simple footnote". It is not on a single webpage - I posted 2 webpages. I read the Ascent thread. I do understand the curves. No other filter company has any more proof that their claims are correct than Purolator...

Exactly the reverse is true. You don't get innovative new products by telling your engineers what to do. You get them by letting them "go rouge", as you put it. That's how you stay in business. But it creates communications issues between headquarters and the plants, which sometimes become...

Read those two sentences back to yourself. You are contradicting yourself ... You have an odd idea about how large corporations work. It's not a top-down dictatorship. And how is H+M GMBH Germany's Spec Sheet any more "official" than Purolator USA's "official" web page?

Unless it was hacked, from Purolator. Seems obvious ...

You missed my earlier point: the two claims actually do agree. I filter that can block 99% of 25up size particles probably can also block 99% of size 46up particles. No conflict. One claim is simply more conservative than the other, for reason we can only guess. One correction: the 99% claim...

I had to laugh. You obviously have never worked for a large international company. Yep, they have communications issues both within the company and with their customers. That much we have established.

I'm just trying to figure out which filter to install on my Expedition. Without any further information, it looks to me that the most likely explanation is that the Boss was updated with more efficient media 1-3 years ago, but that the M+H headquarters is still passing out outdated spec sheets...

But the credibility of the Purolator USA web page claims is supported by the 1-year-old BR test results, but obviously not by the almost 4-year-old Ascend results or the who-knows-how-old measurements on the H+M GMBH Germany spec sheets. It's an unsolved mystery ...

From https://www.purolatornow.com/en/products/oil-filters/purolator-boss.html :

From https://mannhummelcatalogs.com/products/purolator-oil-filter-catalog/prod_01HC0BSQS33T8V6QA9R84YTGZR (note the circled text):

Wouldn't the pressure relief valve prevent soil starvation? And how can you tell on the photo which louvers are closed, which are plugged up, which have a shadow on them from the other side, and which have slits that we cannot see through due to orientation?

There seems to be a big argument on this forum about which efficiency results are correct for the Purolator Boss. It seems to me that it is most likely that all of the results are correct. They actually do not contradict each other. The fallacy is to believe that any of them state the efficiency...

Aren't these filter media made up of translucent strands? If so, by definition, light goes through them. So, light spots in these photos have nothing to do with their ability to block particles.

Please post your source of the Boss pictures you posted and the 50%@22 microns result. Thanks!

Bear grease.

I had an Atomic 4 engine in my 1976 sailboat (which I bought in 1982) that had no filters whatsoever. I added a water separating gas filter, but never an oil or air filter. I think that the engine was a pre-war design, raw water cooled with a flat head and an updraft carburetor. The manual...

When I replaced my OE Goodyear run-flats with Continental run-flats on my BMW last year, I had the tech throw the best old tire in the trunk. A few months ago, we were returning from a day trip on a two-lane country highway over 50 miles from our home when we heard a loud bang, followed by a...