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Ok from what I've always seen oil comes through the big hole that's a thread stud that the oil filter attaches to it goes through that big hole and is forced through the filter and then to drain after that which means all the particles are still on the inside of the filter so when your car turns off it flushes back into the motor. I could have this completely backwards but for some reason I thought this was correct.
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85 rx7 gsl-se - AA tags/ never ending project will never run
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