The valve in the filter is a by-pass relief valve. It's purpose is to allow cold oil to go around (by-pass) the filter and or if filter is plugged same thing. This is used on engines with full flow lube systems where all oil goes from pump to filter and then to engine component. Some engines have the bypass in the filter base, others have it in the filter. It is really not a pressure relief valve as that has a different function. It regulates maximum pressure in the system and your engine will also have one of those before filter and components. Like others have said, some engines have full flow, some have by pass filters. It doesn't mean it bypasses the filter, rather it just filters oil in parallel with oil gallery and filtered oil just goes to sump, not to engine components.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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