See also:

Adjusting the EQ (Equalizer)
For vehicles with an equalizer: 1. Press the TONE button. 2. Select EQ. 3. Select the setting. Press the BACK button to go back to the Tone Settings menu. ...

Engine Air Cleaner/Filter
Engine Air Cleaner/Filter ...

Fuel Additives
To provide cleaner air, all gasolines in the United States are now required to contain additives that help prevent engine and fuel system deposits from forming, allowing the emission control system to ...