Another question Driving comfort V70 I, Diesel

Moin, again a question to you, especially the diesel drivers. This WoEnde drove for the first time a longer distance: HH – B – HH incl city 760 km. The car is up to exactly 130 km/h according to Tacho and approx. 2,800 rpm really quiet. But above it (exactly from 3,000 rpm) it gets quite abruptly loud. At 160 it seems to be quieter again, or the engine noise is overlaid by the other operating noises. Is this also so, or could it in my case also be a Fr age the old engine bearing e.g. that 140-150 km/h simply does not make joy? Wheel bearing, Diff, etc are rather not…. Thanks to you Klas