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:
Resetting user data when the vehicle changes owners
If the vehicle changes owners, all user data and system settings should be
reset to factory defaults.
Vehicle settings can be reset at different levels. Reset all user data and system
settings to their original factory defaults when the vehicle changes owner...
The radar sensor is used by several driver support systems to detect other
vehicles.
Location of radar sensor
The radar sensor is used by the following functions:
Distance Alert*
Adaptive Cruise Control*
Pilot Assist*
Lane Keeping Aid
City Safety
Steering assistance at risk of collision
Any modifications to the radar sensor may make its use illegal...