Vibration in steering wheel and body 2003 S60 T5

[dm5hats]

I have this very annoying vibration, felt through the steering wheel and the seat. Car is in idle at about 750rpm. It seems to have become worse over the last few months. Dealer says it's "normal" and will not do anything other than check the computer codes and the condition of the engine mounts. I want all the mounts (engine and trans) replaced, but they don't want to.
Does anyone else have similar problem? What is the solution?
The S60 has 156,000km on it and I would like to solve the problem before the extended warrantee is over at 160,000km
Hope you can help