Consumer Reports May '13 issue, under "101 Secrets From Our Experts," p.17, "Don't bother using nitrogen in your tires to keep up tire pressure. It's a waste of money. Air is 80% nitrogen anyway, and air or nitrogen will leak out of tires over time, our tests show. Check your tire pressure regularly." p.19, "You don't have to change your oil every 3,000 miles as some service shops suggest. Follow the interval recommended in your owner's manual, usually 5,000 miles or more."
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Penna. until '68, Florida since '73.
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