2007 Volvo S80 Owner's Manual - Page 171

Octane rating Volvo engines are designed to achieve rated horsepower, torque, and fuel economy performance using premium 91 octane fuel. Volvo recommends premium for best performance, but using 87 octane or above will not affect engine reliability. In demanding driving conditions, such as operating the vehicle in hot weather, towing a trailer, or driving for extended periods at higher altitudes than normal, it may be advisable to switch to higher octane fuel (91 or higher) or to change gasoline brands to fully utilize your engine's capacity, and for the smoothest possible operation. MINIMUM NOTE When switching to higher octane fuel or changing gasoline brands, it may be necessary to fill the tank more than once before a difference in engine operation is noticeable 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 to certain forms of cancer. Many fuels contain benzene as a solvent. Unburned benzene has been strongly linked to certain forms of cancer. If you live in an area where you must fill your own gas tank, take precautions. These may include: standing upwind away from the filler nozzle while refueling refueling only at gas stations with vapor recovery systems that fully seal the mouth of the filler neck during refueling wearing neoprene gloves while handling a fuel filler nozzle. Use of Additives