That changing the oil filter twice as often as the oil seems bass-ackwards to me. For one thing, I even have an owner's manual that specifies changing the filter every other oil change! For another, really, what do you think you're draining out? Is there so much gook in there that the filter media is at capacity??? I doubt it! What is the nature and source of all this gook? Hell, my old V-dubs didn't even have filters!
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