How to fix AUDI steering oil owerflows from reservoir

Usually you can see if the pump is leaking. Most times it's a hose, or in your case, I'd look real close at the rack and pinion unit that's mounted in a hard to see spot under the car. It can be leaking into the rubber boots that are on both ends of the unit, then slowly leaking out while you are driving. I would bet this is the problem as the noise you are describing happens when the system has air in it, and as you work it back and forth, it purges the air.

Check up the hydraulic power steering pump.
See picture below for 1.6, 1.8 liters Audi (4 cyl.) engines:

If you find leaks and noise when runing, the hydraulic vane type pump is damaged. The pump **** air inside and mix air with oil resulting foam. Therefore fluid volume inside steering instalation rises. Then pressure overflows oil from the reservoir. You need repair or replace hydraulic vane type steering pump.

1. Pentosin 11S Synthetic Mineral Base Audi Power Steering Fluid

Bilstein 7.1 Mineral Base Audi Power Steering Fluid

Power steering fluid level checking:
- vehicle stationary
- front wheels in straight ahead position
- engine at normal operating temperature
- remove cap with dipstick from expansion tank and wipe off
- reinstall cap with dipstick and remove again
- fluid level between "min" and "max" markings
- top off with G 002 000 hydraulic oil if necessary
Power steering system capacity is around 1 liter, but it is not necessary to periodic change the hydraulic oil!
If oil level has dropped to the "min" marking, check power steering system, including hoses and lines.
It is not enough simply to top off the hydraulic oil !!!

you changed all the oils and fluids. uumm theres really not much you can do when it comes to that check the belt and if thats not it get a new pump