Originally Posted By: ZeeOSix
The WIX 57502 has the 22 PSI bypass valve and the FL500S is supposedly only an 8 PSI bypass valve. I doubt the Ford guys want to run a filter with such a high bypass valve setting if their motors really don't need it. Is WIX just making all their filters with a 22 PSI bypass valve to cover all bases now?
I've read some of the posts (Jim Allen, ZeeOSix, etc.) from the past about bypass events, and of course GM's memo about how they really want to see 22 psi on just about all gasoline engines they have made since 2012 (clearances smaller, higher oil pressure, etc.).
The only bad effect I can see of running an oil filter with TOO HIGH of a bypass pressure threshold is that it makes the oil pump work too hard on cold startup, delaying flow to the engine with thick oil in the sump.
In a nutshell, choice of bypass pressure is an engineering choice that takes into account cold, thick oil trying to get to the bearings. It also takes into account the cost of too many bypass events washing junk into the bearings. Let GM engineers dictate it.
That said, I do wonder why the famous GM memo says ALL engines made since 2012. They put the small PF64 on big Corvette V8's and their tiny 1.5L turbo alike! And Corvettes use 5w30 or 0w40 while the 1.5L uses 0w20. Its tempting to say the 1.5L has low oil flow compared to the big V8, and the lower viscosity amplifies that difference even more, meaning its probably less important in a 1.5L vs. V8s here.
Add to that the lower differential pressure of using an oversized oil filter. I can use a very long PF63E sized oil filter even though a PF64 is the spec. That lowers the frequency of bypass events even further on the 1.5T. (Other engines don't have room for a longer oil filter though, but the the 1.5L on an '18 Equinox does for me.)