How to Change Your Motor Oil. Plan to change your motor oil every 3,000 miles or every 3 months if you want to be on the safe side, but know that most cars no longer require an oil change after every 3,000 miles. You will not damage the engine by letting it run 4,000 miles in between oil changes. However, if you've been driving in very hot and/or dusty conditions you should stick to the 3,000 mile schedule, or even more frequent changes. Read more: www.ehow.com/video_11_change-m...