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for a car that has very slowly lost refrig over 18 years I think slowly adding r134 and monitoring the vent temp is a good enough approximation of the right way to do it, especially considering you monitored pressures to make sure they didn't get wonky
If it leaks at a much faster rate or fails to cool going forwards, you may need to bust out a bit more science, but I imagine it will be fine for another decade or 2
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84 930
18 Cayman GTS
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