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Detailed Audi Audi A4 air filter replacement instructions for the 2002-2005 3.0 liter engine. Wondering how hard it is to replace your Audi A4 air filter. DIY with Blauparts' helpful how-to Audi A4 air filter video. The recommended interval is to change your Audi A4 air filter once a year or every 30,000-40,000 miles, whichever occurs first.
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