Excellent!
Curious how some would single out one manufacturer for possible change over the time since this study was posted. Any could have changed, for better or worse.
It's the most recent study I've seen, only 2+1/2 years old and IMO, quite well done. Excellent quality pictures and data speadsheet.
Some observations. As said, creator deep lava, clearly didn't understand the ST/STP combo ADBV/bypass valve.
Loved creator comment regarding Fram Extended Guard. "The XG Fram is, can't believe I'm saying this, a decent filter."
Having just finished cutting open a Purolator Premium Plus, I was a tad surprised to see PPP(Mopar) base end bypass in the study. The L14610 I cut open had dome end bypass and no string. I suspect the difference has to do with the L14670 being a larger filter and different applications. PPP and Mopar both look well made.
The Pure One based on the study data, still looks to be a great value.
Since the study Purolator has increased the efficiency of the Premium Plus, now Classic white from 96 to 97.5%. And the Pure One from 98 to 99.9% efficient.
Thanks for posting.