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katy · 11-23-2019, 12:49 PM

It is called a by-pass system. Part of the oil goes through the filter and the remainder goes through the original route.
This type of system was used on many makes of cars for many years until they switched over the the full flow system which is much better.

11-23-2019, 12:49 PM	#2
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,046	Re: Oil Filter Model A on timing cover It is called a by-pass system. Part of the oil goes through the filter and the remainder goes through the original route. This type of system was used on many makes of cars for many years until they switched over the the full flow system which is much better. __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!