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Replace the power steering fluid at Porsche Cayenne (V8) from red to g

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Hello,I've bought a used Porsche Cayenne (V8). With fright I have seen that in my reservoir from power steering there is red Oil (probably ATF-Oil ?) instead of green oil (fully synthetic Pentosin CHF 11S).

Has anyone ever replaced oil completely ? How can I change the oil?

How can I make this (with which method ?) --> Vacuum method and refill, vacuum and refill ... ..or is there something like a drain plug?Unfortunately, the oil level is at the minimum (no oil loss, no steering problems). Should I only red oil top up again?

Thanks for answers in advance.

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These power steering systems use a specific fluid, not ATF, and in this case Pentosin 202 (which is dark green and replaced the CHF 11s). Depending upon your situation, you can remove all the fluid from the tank by using a suction device and then refill with the correct fluid. The optimum way to change it is to disconnect the low pressure return line under the car and then run it at idle until the fluid is out; just be careful to shut it off promptly. Then button everything up and refill the system.

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I'm more with JFP on this that you want to completely drain the system, not just the resevoir. I think you may be able to find one of the hoses underneath going to the oil cooler and just drain it from there. I would refill and run it for a few minutes and do it again. You really don't want to replace the pump or damage the rack.

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