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Originally Posted by John V
You should NEVER have to add more fluid. Just flush it once a year (minimum).
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That's not true, as the clutch disc and brake pads wear the fluid level in the master cylinder will go down and adding some quality dot 4 fluid is fine. Also, once a year flush is too often unless you are doing track work on a regular basis. For standard driving, a flush every two years is more than enough and what Porsche recammends.