See also:

Use of Additives
With the exception of gas line antifreeze during winter months, do not add solvents, thickeners, or other store-bought additives to your vehicle's fuel, cooling, or lubricating systems. Overus ...

Input volume
Adjust the input volume in the RSE menu, under A/V AUX input volume. ...

Bulb specifications
NOTE Please consult a Volvo retailer’s Parts department for the most up-to-date specifications. ...