Buick Lucerne Owners Manual

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Activating a Setting
1. Turn the Menu knob to highlight the setting. 2. Press SELECT to activate the setting. ...

Fuel E85 (85% Ethanol)
If the vehicle has the 3.9L V6 engine (VIN Code M), you can use either unleaded gasoline or ethanol fuel containing up to 85% ethanol (E85). See Fuel. In all other engines, use only the unleaded ...

Check Gas Cap Light
If your vehicle has this light, it will come on if your gas cap is not securely fastened. ...