If it's coming close to your next oil change and your oil levels are still pretty high, you may be wondering if just a quick fill-up may be more convenient. While your vehicle may not be running low, the remaining oil may be dirty. When you top off your vehicle with new, clean oil, it will mix with that dirty oil and result in poor performance. If you find yourself in an emergency, topping off your oil can be a good idea, but we recommend getting a full oil change to follow it up as soon as possible.