2007 Volvo S40 Owner's Manual - Page 113
2007 Volvo S40 Manual
Page 113 highlights
1 To prevent injury from contact with hot surfaces, do not inspect your vehicle's transmission fluid yourself. Have your vehicle's transmission fluid level inspected by a qualified Volvo service technician. 125 06 Starting and driving Fuel requirements 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. 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. Deposit control gasoline (detergent additives)