If you follow proper maintenance method of changing air filter on you Buick Regal on a regular basis, this will provide significant impact on its engine life and performance. Air filters, as simple device as they seem, own one of the most crucial roles in maintaining performance of an engine. Through this air-cleaning device, proper air flow is kept allowing for smooth and maximized engine combustion process. If the device fails to let in cool air flow, there must be something wrong with it. If this is the case, then replace the device. Air filters are replaced annually on average cars; while those that are mounted on cars driven on a rather dusty and rough road areas, they may require replacement at least every six months. Following this replacement interval will lead to a vehicle always at its peak performance. On the other hand, neglect to this need may cause the car to incur negative consequences such as lost power, poor fuel economy, and lost mileage. To avoid these things, always make sure to replace your Buick air filter at proper interval. Likewise, always remember to trust a good name when it comes to replacement air filters, such as K&N air filter. 2001 – 2004 Buick Regal will do better if installed with K&N air filter. You don’t want to compromise performance of your car, so always keep K&N air filter ready for your Buick.