I would get a second opinion, and be highly suspicious of this expensive (and unusual) diagnosis. I have been on this board for a decade and this issue with the Boxster is atypical.
Is the car having this issue...or is your mechanic seeing $$$$$?
If it were me, i might just run a bottle of techron through and drive the car.
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SOLD - 2002 Boxster S - PSM, Litronics, De-ambered, Bird Bike Rack, Hardtop, RMS leak...
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