Incorrect information isn't something to be "valued". Obviously the ISO efficiency on the M+H spec sheet is correct (for all the Purolator models), as the president of M+H has said the spec sheet is correct, and as you know the Purolator website has now been updated to reflect the spec sheet that is based on an official ISO 4548-12 test -
LOOK HERE at the bottom of the page. Purolator hasn't updated their efficiency footnote for the ONE yet, which also does not match the official spec sheet of 99% @ 25u instead of the 99% @ 20u they show for the referenced PL30001 on their website.
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.
Here is the reply: "The specification sheet for the PBL30001 shows 99% efficient at 46 micron. What is on the specification sheet is correct. What is on the website will be updated to reflect the same at 99% efficiency."
Mystery solved ...