The "rule of thumb" I was told when I got my first car was to change the oil every 3 months or every 3000 miles, whichever came first. My current vehicle requir

The "rule of thumb" I was told when I got my first car was to change the oil every 3 months or every 3000 miles, whichever came first. My current vehicle requires oil changes at 7.5k miles or 7.5 months, sooner under "severe" driving, so that rule has definitely changed.