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My info is right from stuff we got from GM for the "A" and "B" and what they replace based on the old Duraguard (blue non "R" filters) and Ultraguard Gold (black "UPFXXR" filters) which are now gone as a result of the First Brands issue.
So far they are all ones "not to stay away from"? I haven't cut any open yet though to compare A and B style.
As for what they replace:
B = regular "blue" Duraguard
A = The "black" Ultraguard Gold. So like UPF63R is now the PF63A.
C = That I can tell, alternate supplier or same supplier but alternate model being used.
Right now on like PF63 for example though, the "B" is on backorder again so we are using the "A" for both PF63 and UPF63R usage. Same with PF64s, the B is backordered, so we are using A.
PF66, the most recent case we got were actually from SAIC-GM from China (GM ETurbo engines so 1.0, 1.2 and 1.3 turbo 3 cylinder). They look like engine assembly plant filters to me which even for US products have different labeling on the cans. These ones are blue with the SAIC-GM logo on them.
I'm still unclear on the multi-supplier A/B/C filter designations, as they all supposedly come from different suppliers now.
A = OE, which replaces "blue" AcDelco filters of yesteryear?
B = ?
C = ?
One is supposed to be their value line/ budget friendly. We need to know which ones to stay away from.
The video for the Ford 7.3 tear down is up. He's not a fan of the oil pump design. This one died from the known cam/lifter failure issue.
For some reason this site is not letting me embed a link but here it is to copy/paste:
https://youtu.be/4Memby-jB9I?si=SmK1VuBgZ7UgsZCz
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