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:
(Option/accessory.)
There is a function button for driving at low speeds with Hill Descent
Control in the center display's Function view if the vehicle is not equipped
with a drive mode control in the tunnel console.
Selecting Low Speed Control in the center display's Function view
Tap the Hill Descent Control button to activate or deactivate the
function...
Characters, letters and words can be entered in the center display by handwriting
them on the touchscreen.
Tap the button on the center display's
keyboard to switch from the keyboard to handwriting mode.
Space for entering characters/letters/
words/parts of words...