Thanks to Daman, I got an AC-Delco UPF-52 to check out.
I decided to compare it to a PureOne PL24011 and a Regular Delco PF-52.
These are equivalent filters for the same application.
I was a little surprised the UPF52 was using a nitrile anti-drainback valve.
Not that that’s a problem but all the premium filters seem to use silicon nowadays.
A close up of the UPF52 media. That stuff is really thick—and packed in there. 34 pleats.
And the standard PF52--48 pleats:
Dip test--left to right and top to bottom: K&N, PF52, UPF52, and PureOne
Time to fill the center tubes to the level of the oil mix:
K&N and PF52 tied at about 60 seconds
PureOne = 3 minutes
UPF53 = more than 5 minutes
Left to right, PF52, UPF52, and PureOne
There is an area of hard to see settlement in the UPF 52 because the oil is still a little cloudy after more
than 48 hours. I tried to highlight the picture a little bit. This was the clearest of the photos.
I ran two identical dip tests with these three and the UPF52 filtered the best both times.
The UPF52 was a little bit ahead of the PureOne on filtering out my talc, but the flow rate was by far
the slowest of any filter I’ve tested so far (but also the best filtration I’ve ever seen…but I might just stick with the P1 all things considered.
The regular PF52 did a really good job too and seems to be an excellent choice.