AC Delco PF63 Cut Open

[ZeeOSix]

Well then maybe less restriction, or perhaps reduced bypass action?

"Better flow" when it relates to oil filters means less delta-p across the filter at the same flow rate.

If the positive displacement oil pump is not in pressure relief, then the same flow has to go through the oil filter regardless of filter restriction (delta-p). Yes, a more restrictive filter will have a better chance of going into bypass, depending on the filter bypass setting, and the oil viscosiy and engine RPM.

 

[revrnd]

AC Delco PF63 of GM 6.6l gas. Right at 5k miles on filter, approximately 15k on vehicle. I think that these are hard to beat for the price ( I know that there is a lot of hate for the e-core filters, but I don’t mind them at all. Any early issues have been long since resolved. I used to be a wix fan boy, but since they are no longer made in USA (WL10255 is made in Mexico) and they cost twice as much, I will be using these PF63’s for the foreseeable future.

Purchased last week at an O'Reilly store in NH last week:

This was the 2nd filter I checked. The 1st was made in Mexico.