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#4543452 - 10/14/17 06:42 PM AC Delco oil filter bypass pressure
TexHawk Offline

Registered: 11/17/08
Posts: 9
Loc: Texas
Does anyone know where specs are for the bypass valve opening pressures for various oil filters?
Especially, AC Delco PF64?

I have seen some information that the PF64 bypass pressure has been increased to 22 PSI, while the WIX equivalent (57060) still has a bypass pressure of 12 PSI. The increase in pressure is supposed to be because GM engines now have a variable volume oil pump and the higher pressure is to keep more unfiltered oil from being dumped in the engine...

#4543817 - 10/15/17 08:53 AM Re: AC Delco oil filter bypass pressure [Re: TexHawk]
Linctex Offline

Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

#4544077 - 10/15/17 01:20 PM Re: AC Delco oil filter bypass pressure [Re: TexHawk]
ZeeOSix Offline

Registered: 07/22/10
Posts: 17762
Loc: PNW
Maybe AC Delco filters are pretty restrictive so they bumped up the bypass setting for that application. The less flow restrictive a filter is, the lower the bypass valve setting can be.