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Nice combo!

Engineering and R&D is located in West Bridgewater MA. Headquarters in Memphis TN. VAFI factory fully ISO certified.

A good synthetic vs conventional comparison below.(Before R&P, I believe EP was used). Honestly I’m not to impressed with either of the results. I’ve seen very high mileage internals look like new with M1 TriSyn PAO/AN/Ester formula. Which is now used by HPL courtesy of Dr. Rudnick.

This one looks good. Thanks

PCEO continues to impress!

I called PG because of this confusion. Official ISO numbers for PG made 10K filters are: 98.7%@15 microns 99.5%@20 microns 99.9%@25 microns Marketing from the various brands decides which to publish. Service Pro shows all.

I believe Purolator.

Thanks for your hard work. Much appreciated. Since the Royal Purple, Amsoil, and Endurance are the same filters this is a good starting point(to add an Endurance at 15). Hopefully as time goes on we’ll have more data!

It was me. Holes were carefully drilled then opened with needle nose for a wider view. Leaf spring was 100% not disturbed. That’s exactly how it came from the factory. Many have been tested out of the can. My test was an in can test to prove assembled pressure made no difference. If you search...

These are normally a good 5k filter, after that the silicone ADBV is a must IMO. Upgrade to the Select. Can’t tell if this is the Wix version or PGI.

5k oci’s don’t guarantee clean pistons(I learned the hard way). R&P will keep those pistons clean. If thats even a problem on these…

Here’s the master thread on the Endurance. Nobody is saying it’s “catastrophic” it’s just not the efficiency you’re paying for IMO. It’s a manufacturing/QC defect. https://bobistheoilguy.com/forums/threads/fram-endurance-flashlight-test-in-canister.386911/

This one I tested doesn’t leak.

The sealing surface is on the top ring where the ruffles sit. Fram use to have a seal there on the OG Ultra’s.

I haven’t tried these. Currently using Carquest Premium. https://bobistheoilguy.com/forums/threads/carquest-premium-94010-for-pentastar.395401/

100% engine and conditions dependent.

Leakage point and ruffles below. Thank you for the particle count!! As suspected 15 brings a leaking Endurance to around OEM levels. A non leaker would most likely perform like the Amsoil(same filter) around 12.5.

Member @twX was gracious enough to compile all the UOA particle count data posted and average by filter. Yours performed the same as a Boss indicating it does indeed have a leak.

Zebra stripes

Definitely a leaker. Right in line with the Boss.