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Why don't you just use the genuine Porsche transmission fluid and be done with it? Its good for 90k before changing out so the quality and correct weight is not in question.
Care must be taken with aftermarket gear oils as GL4 rated oils are good for the synchro's and not so good for the transaxle gear mesh while GL5 rated oils are good for gear mesh but not so good for synchro life as the fluid tend to be too slippery causing the syncho's to skid.
As far as I know, Porsche have never released the techno details of its gearbox oil.
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