The Cabin Air filter, if equipped, is recommended every 12 mo./ 15,000 miles. Fuel filter(s), if serviceable, are every 5 yr / 30,000 miles. Some diesels recommend more often so check with owner's manual, or call dealer. Air filters should be changed no later than 5 yr / 30,000 mi., but I would inspect that one and the PCV valve every oil change. Gotta have something to do while you let the oil drain, right? Check some tires too.
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