Volvo XC90: Specifications / Transmission fluid specifications
Under normal driving conditions, the transmission fluid will not need to be
changed during the transmission's service life. However, it may need to be changed
if the vehicle is driven frequently in adverse driving conditions.

Engine oil of type VCC RBS0-2AE 0W-20 must be used. Lower oil grades may not
offer the same fuel economy, engine performance or engine protection.
Volvo recommends:
General
See the Service and warranty booklet for information about oil change intervals...
The medium in the hydraulic brake system is called brake fluid and is used
to transfer pressure from e.g. a brake pedal via a master brake cylinder, which
in turn actuates the brake calipers...
Other information:
Polish and wax the vehicle when the paint is dull or to provide extra protection.
The vehicle does not need to be polished until it is at least a year old. However,
it can be waxed during the first year. Do not polish or wax the vehicle in direct
sunlight...
The heated rear window and door mirrors are used to quickly remove condensation
and ice from the glass.
Activating and deactivating the heated rear window and door mirrors from the
center console
A button in the center console offers quick access to the heated rear window
and door mirrors functions...