Climate compressor oils ?

Howdy municipality,

my little brother was last week with my former 100 C4 2.6 quattro at friendly Audi dealer for inspection and they oiled him the climate compressor. The part used to make a hell of a noise at high speeds (>4000) and now it's vieeel better... The master praised the car so that you could get sooo good and normal it would cost €120.-...
Well, my four, two, bj. 82, also lets hear a lot from the compressor and the climate is probably identical, isn't it? Ask, has one of you ever oiled the compressor, how you doing and what's the point?

Dicki
Keep cruising....