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pcv=much more effective way to get rid of moisture and nasty corrosive gases that condense and form in the motor every time it gets cold.....like every night whether you drive it or not
back in the "draft tube" days....recommended oil change was every 2,000 miles (oil is contaminated)....motors needed a re-build much sooner even with 2k oil changes (especially rings)....a part of the reason for both.....the draft tube and slow in town driving
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