Demanding driving

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.
See also:
Fluids
Specifications and capacities
A The transmission oil does not normally need to be changed during the
service life of the vehicle. However, it may be necessary to replace the oil if
the vehicl ...
Comfort and convenience
While the interior of the Volvo S40 places an emphasis on style, form has not
been allowed to take precedence over function. The fascia ergonomics have been
carefully designed and drivers will fin ...
Replacing high/low beams/turn signal/parking light bulbs
WARNING
• The engine should not be running when
changing bulbs.
• If the engine has been running just prior
to replacing bulbs in the headlight housing,
please keep in mind that components
in th ...
