How often should I change my engine air filter?

You should change your engine air filter every 15k-30k miles depending on your driving conditions. More often if you commonly drive in dusty areas or dirt roads. If you do not drive a lot of miles then it should be changed every 3 years, they become brittle with age and can start to come apart. A dirty engine air filter can cause the following symptoms:

• Reduced fuel economy
• Engine misfires
• Reduced horsepower
• Gasoline smell when cranking engine