Your new car engine is basically an air pump. The more efficiently it can suck air in and expel spent gasses out, the better it will perform. To ensure that your engine runs as efficiently as possible, make sure you change your air filter regularly (this should be a part of your usual car maintenace process).

The air filter removes harmful particles from the air before they enter your engine. Check your air filter at every other oil change. If it looks dirty, replace it. And even if it doesn't look dirty, you should replace the air filter every 15,000 miles or so.

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