Have you taken a good look at your Lexus GS400 air filter lately? Even if you have glanced at your air filter, and it looked all right, it may not be working as well as it should. Your GS400 air filter can appear to be in good condition, but still may not be letting air get to your cylinders. Air flow is important to your engine, because it runs on a mixture of oxygen and fuel that is ignited inside your cylinders.

Without a good supply of oxygen, you may be experiencing rough idling, sluggish performance, hot engine running, and a loss of fuel economy. All of these symptoms can be caused by a dirty Lexus GS400 air filter.

If you can’t tell whether your air filter should be replaced just by looking at it, how can you find out? The best way to test your GS400 air filter is to remove it from the housing and blow through it. If air passes with little resistance through the filter, then you should be all right for a while. However, if little or no air is getting through your filter, then your engine is not receiving enough oxygen. You should replace your Lexus GS400 air filter at least once per year, and it is even better to replace it with every other oil change. If you want to stop buying replacement air filters and improve your engine’s performance at the same time, consider investing in a high-flow performance air filter that is washable and reusable, so that you may never have to buy another paper air filter again.Browse our extensive online catalogue for a full line of GS400 air filters and performance air filters, and let your engine breathe again.