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:
Trip statistics settings can be reset or adjusted.
Open the Driver performance app in the App view to display trip statistics.
Tap Preferences to
change the graph scale. Select 1, 10 or 100 km/miles for the bar.
reset data after each trip. Performed when the vehicle remains stationary
for more than 4 hours...
In certain demanding driving conditions, Lane Keeping Aid (LKA1)
may not be able to properly assist the driver. In these situations, it is recommended
that the function be deactivated.
Examples of such situations include:
road work
winter driving conditions
poor road surfaces
a very sporty driving style
bad weather with reduced visibility
roads with indistinct or no lane markings
sharp e..