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Old 07-16-2008, 12:21 PM   #10 (permalink)
Master EcoModder
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Join Date: Jun 2008
Location: Northwest Lower Michigan
Posts: 1,006

Red Car - '89 Chevrolet Celebrity CL 4 door
Team Chevy
90 day: 36.47 mpg (US)

Winter Wagon - '89 Pontiac 6000 LE Wagon
90 day: 28.26 mpg (US)
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A larger filter would have more square inches of filter media. So that means when the same amount of oil passes through the filter, the velocity through each pore is less because there are more available. So less pressure is needed to push cold oil through the filter and less use of the bypass valve. Also the filter will stay cleaner longer since there is more media to fill with the same amount of dirt.

Not sure how much of this actually comes into play with regular change intervals.

But I mainly just use bigger filters on my cars because they are a lot easier to get a hold of with the filter wrench. I use the longer 3980 rather than the shorter stock 3387A.

Winter daily driver, parked most days right now

Summer daily driver
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