I can't make out your photos but do you have the most recent cap or are you still on the original? if you have an old cap, taking it off to top up the coolant might not allow you to maintain pressure as it may have lost its ability to seal. Did your mechanics point out that this cap should be replaced every couple of years?
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GT3 Recaro Seats - Boxster Red
GT3 Aero / Carrera 18" 5 spoke / Potenza RE-11
Fabspeed Headers & Noise Maker
BORN: March 2000 - FINLAND
IMS#1 REPLACED: April 2010 - NEW JERSEY -- LNE DUAL ROW
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