My car had the same symptoms as yours does, and it was a huge improvement refilling with the genuine gear oil.
Forgot additives and use genuine Porsche gear oil.
Many have tried other products just to drain it and go back to the factory fill. Save yourself the bother of doing it twice.
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Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | LN Dual Row IMSR | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
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