When properly maintained, there is no reason why a Boxster engine and trans can't run well over 100K and much more.
If it were me, I would swap in Amsoil synthetic fluids all around (engine, trans/diff) and use high efficiency filters in air and oil. This will actually help increase gas mileage too!
Also, I would likely swap out the fluids at 12.5 miles or about a half a years driving for you!
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