From what I have read the original recommended fluid was Pentosin CHF 11S (it is also printed on the PS cap in the engine bay), which was superseded by CHF 202. The two are interchangeable and can be mixed. It seems there was a period when 11S was unavailable, although you can now buy it for slightly more than the 202.
Maybe someone can chime in if one is better than the other?
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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