Here's what to consider:
* Consult your owner's manual: This is the most important source of information. The manual will specify the recommended oil change interval for your specific 2003 Buick Regal engine (considering factors like driving style and conditions). It might suggest an interval based on mileage or time, whichever comes first.
* Mileage and Time: Even if the light isn't on, aim for oil changes at the recommended mileage intervals or the time interval specified in your owner's manual. Modern oils can last longer than older formulations, but this still needs to be balanced against driving conditions and mileage.
* Driving Conditions: Severe driving conditions (frequent stop-and-go traffic, towing, extreme temperatures) shorten oil life. If you experience these often, change your oil more frequently than the recommended interval.
* Light Reset: Once you've changed the oil, you'll need to reset the "Change Oil Soon" light. Your owner's manual will explain how to do this. The process usually involves a sequence of steps using the car's controls (often involving the odometer).
In short: Change your oil according to the recommendations in your owner's manual, factoring in your driving conditions. The light is a helpful reminder, but it shouldn't be your sole guide. Don't delay an oil change just because you're close to the recommended interval or the light hasn't come on. Regular oil changes are crucial for engine longevity.
