ECOGARD XA5785 Premium Engine Air Filter Fits 2005-2011 Audi A6 Quattro, 2006-2011 Audi A6 COMPATIBLE with 2005-2011 Audi A6 Quattro, 2006-2011 Audi A6. IMPROVE PERFORMANCE by changing your vehicle's air filter at least every 12,000 miles (or as recommended in your car owner's manual); to ensure your vehicle's engine has the clean and efficient air flow it needs for fast acceleration and long term power. AVOID INCREASED ENGINE WEAR caused by dirty air intake filters that may allow damaging particles to get into the engine. FACTORY FIT FOR EASY INSTALLATION. Replaces: FRAM CA10217 Purolator A25785 WIX 49846 OE 4F0 133 843. SPECIFICALLY ENGINEERED AND TESTED for Audi OE (original equipment) engine air filter's fit, form, and function.