Filter with no bypass valve?

[RamFan]

I'm changing the oil in my girlfriend's Monte Carlo this weekend so I picked up a Purolator Classic 25288 and noticed it doesn't have a bypass valve. I went to Purolator's website to get some more info and sure enough on the filter description it says that it doesn't have a pressure relief valve, at least I know I didn't pick up a faulty filter.

Anyone know why some filters don't have pressure relief valves?

 

[OilNerd]

It's designed for engines with the bypass in the engine block. My GM's use a PL10111 with no bypass valve in the filter.

 

[RamFan]

Didn't even know some cars were like that, thanks!

 

[Chris142]

chevy v8s from atleast the late 60's to the 90's used a block mounted bypass valve

 

[KCJeep]

The filters for our Chevy 3.1 and 3.4's don't have them either, it's all good.

 

[Quattro Pete]

Originally Posted By: OilNerd
It's designed for engines with the bypass in the engine block.

Yup. Same goes for engines using cartridge filters - bypass is somewhere else.