See also:

Power brakes function only when the engine is running
The power brakes utilize vacuum pressure which is only created when the engine is running. Never let the vehicle roll to a stop with the engine switched off. If the power brakes are not working, ...

Fuel Formulations
Do not use gasoline that contains lead as a knock inhibitor, and do not use lead additives. Besides damaging the exhaust emission control systems on your vehicle, lead has been strongly linked ...

Minimum octane
Typical pump octane label Volvo recommends premium fuel for best performance, but using 87 octane or above will not affect engine reliability. Volvo engines are designed to achieve rated hor ...