How often should I change the air filter in my car?

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In general, experts recommend a simple rule of thumb for changing your air filter based on the size: 1 Change 1- to 2-inch filters every three months. (Scheduling filter replacements with the start of each new season is an… 2 Change 4-inch filters every six months (summer and winter). 3 Change 5-inch filters once a year. More …

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