Follow your owner’s manual. For the F-150, Mustang and Ranger it says replace the cabin air filter every 20,000 miles, and sooner in severe use: 10,000 to 12,000 miles on the F-150, 10,000 on the Mustang and Ranger. Ford’s general support page gives a range of 15,000 to 20,000 miles depending on model. If airflow […]

