That's especially true when you're on a long car trip, but there's nothing special about a road trip that specifically dictates the timing of an oil change. If your trip will interfere with your next oil change whether it's based on time or mileage, then you should take your vehicle in for service before heading out. Getting the oil change done beforehand can also save you some time later. However, if you expect to be back home from your trip before the oil change is due, then you can just wait and take your car in at your convenience. That way, you're in a better position to make the right decision about when your oil change should be done.