Volvo S40 Owner's Manual page 133

2007 Volvo S40
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)
Volvo recommends the use of detergent gasoline to control engine deposits. Detergent gasoline is
effective in keeping injectors and intake valves clean. Consistent use of deposit control gasolines will help
ensure good driveability and fuel economy. If you are not sure whether the gasoline contains deposit
control additives, check with the service station operator.
NOTE
Volvo does not recommend the use of store-bought fuel injector cleaning
additives.
Unleaded fuel
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