Quote:
Originally Posted by 2017Darkness
The internal bypass valve is the only difference. The 64 has a 22psi bypass where the 48 has 15. You should be fine, but some people think the lighter bypass lets more junk bypass the filter...The 48 has been used on Corvettes for quite some time.
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I agree.
For most of us who take care of our cars, the bypass valve never opens.
The rating of that valve is the pressure differential across the filter media (called "PSID" by manufacturers).
Pressure across the filter is related to:
1) Oil temp/viscosity
2) flow rate
3) the extent to which the filter media is clogged.
Here is some data for a Purolator filter:
https://www.bobistheoilguy.com/forum..._vs._PSID_Data
As someone else said, "If you are cold starting your car in Alaska AND immediately high-revving the engine AND your filter is very old you MAY get the bypass valve to open."