Thinking it over, the president of Purolator, or whatever the title, didn’t know what was on his or her own website. They called tech and they said 46 microns, same as they tell everyone.
In there somewhere are the people in the USA who performed the efficiency testing, and came up with the numbers. Or the ones who fabricated the numbers?
It isn’t quite over yet, if you are fair. Does not add up.
The standardized test is what it is, a lab test with concentrated test dust. Developed on best effort basis to mimic reality. Its not the same as modern clean running engines filtering oil. Also, something does not add up. They did the best they could to make a lab test, but is it reality?