CQ Premium 85372 vs STP XL S2XL

[TXCarGeek]

Did not cut them open but ended up with these two filters to use on my brother’s ‘08 Navigator with 340k miles. I thought it was interesting that there are obvious differences between the Vietnam made Carquest Premium and the China made STP XL. Biggest difference seems to be the baseplate design.

Are these supposed to be equal in terms of efficiency?

 

[EvoMan]

They are supposed to have the same efficiency.

G

Post in thread 'Not another Valvoline Restore and Protect thread'

Aug 11, 2025

Love talking filters!

Yes, I’ve called PG several times now and the official PG EX(Extended Life) efficiency range is as follows. This also applies to the 10k filters made by PG for others.(Carquest Premium, Microgard Select etc.)

98.7%@15 microns(absolute)
99.5%@20 microns
99.9%@25 microns

The website has finally been updated for the EX showing 25 as the micron rating. The regular 5k filters are still incorrect and show the EX range like above(15-25).

PG has factories in Vietnam, China, and S. Korea. You will see some slight differences between factories but QC remains fantastic...

• GW.

• 
•