Mazda Mazda 6 2002-2008 Fuel System Specifications

The 2002-2008 Mazda 6 is compatible with regular unleaded gasoline with an octane rating of 87 or higher. Using higher octane fuel is not required but may improve performance in certain conditions. Avoid using diesel or ethanol blends above 10% (E10) as they can damage the engine and fuel system. Always refer to the owner's manual for specific fuel recommendations.

Regular maintenance for the fuel system includes inspecting and replacing the fuel filter every 30,000 miles, checking fuel lines for leaks or wear, and using fuel system cleaners periodically to prevent carbon buildup. Additionally, ensure the fuel cap is tightly sealed to maintain proper pressure and avoid triggering the check engine light.

To replace the fuel filter, first, relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls. Locate the fuel filter, typically under the car near the fuel tank. Disconnect the fuel lines using a line disconnect tool, remove the old filter, and install the new one, ensuring proper orientation. Reconnect the fuel lines and reinstall the fuel pump fuse.

Poor fuel efficiency can result from a clogged fuel filter, dirty air filter, faulty oxygen sensor, or improper tire pressure. Start by checking and replacing the air and fuel filters. Inspect the oxygen sensor and tire pressure. If issues persist, have a professional diagnose the fuel injectors, spark plugs, and engine control module for potential problems.

To optimize fuel performance, use high-quality fuel, maintain proper tire pressure, and replace air and fuel filters regularly. Avoid aggressive driving and excessive idling. Periodically clean the fuel injectors and throttle body. Ensure the engine is tuned correctly and the oxygen sensors are functioning properly to maintain optimal fuel-air mixture.