dumb question, but how exactly does the anti drainback valve work in a stock, vertical, configuration? i guess it keeps the oil in the filter from flowing down the oil pump channel into the pan?
or, does it prevent oil in the top of the engine from the effects of gravity?
both do the same, i guess, one just forms a "plug" in the filter, the other is more like a seal created from a vacuum.
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costs too much
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