The front control arm bushings wear out, resulting in alignment issues and squeaking and/or knocking noises from the front end. Worn bushings will require replacement.
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Most reported 2006 Volvo XC70 problems
It's very common for the turbo return line seal to leak oil. When they leak it can be minor seepage that may be hardly noticeable to a very large oil leak that can cover the entire underside of the vehicle. The part is very inexpensive but the job takes at least an hour due to the AWD differential that is in the way.
The upper engine mount may wear prematurely. Symptoms may include a harsh feeling when the transmission is shifting and roughness when the engine is idling. Worn engine mounts should be replaced as necessary.