Yes, it is a bypass style filter. So as Steve pointed out the only amount of oil that had to flow through the 5 what look to be about 1/4” holes is what would flow through the one small hole in the center. In the NAPA filter the oil just flows through the two smaller holes. I would guess the mfg. of the filter you took off has 5 hole end plates punched out like that by the thousands. Since many filter applications are a general diameter they can thread the center hole for the proper threads and use those same plates for hundreds of applications. Many of which today are full flow which require to be able to flow all the oil the pump puts out. The mfg. of the replacement NAPA filter which is WIX for some reason decided to utilize a special end plate for this type of bypass filter.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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