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:
Use of Additives
With the exception of gas line antifreeze during winter months, do not add solvents,
thickeners, or other store-bought additives to your vehicle's fuel, cooling, or
lubricating systems. Overus ...
Resume set speed
If cruise control has been deactivated temporarily,
it can be reactivated by pressing .
The
vehicle's speed returns to the most recently set
speed.
WARNING
There may be a significant increas ...
Points to keep in mind
• Do not export your Volvo to another country
before investigating that country's
applicable safety and exhaust emission
requirements. In some cases it may be difficult
or impossible to comply wit ...
