For years, the accepted oil change interval (as per the car-makers) has been every 3 months or 3 thousand miles, whichever comes first. Why? Because the oils of yesterday degraded and broke down when left in the crankcase environment for longer than the prescribed interval.
Research and development between carmakers and petroleum companies has resulted in improved engine lubricants that properly lubricate your vehicle's engine as well as keep the inside clean of sludge buildup. This buys you more time between oil changes.
Yes, oil is much better than it used to be and there's no doubt that engines are better protected with today's new lubricants, but, I am still a bit squeamish about leaving petroleumbased oil in an engine for 7,500 miles.
So, I have revised my thinking a bit regarding extending oil change intervals. My current revised oil change interval recommendations are: change regular petroleum based oils every 4 to 5 thousand miles and full synthetic oils every 5 to 7 thousand miles.
At Molinaro's we use Wolf's Head Synthetic Motor Oil for all oil changes. Check our specials page to see if we're currently offering an oil change coupon!