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If you used prestone or the like then you should flush out the system and use the proper Porsche coolant for your car. In the event you need to top off and don't have any available, just use water.
I have never heard of somebody overtightening the cap, but if you cranked on it with a wrench and stripped the threads then yes, you should replace the tank. Using silicone or band-aiding it will just cause more problems in the future. Save yourself the hassle later and replace the tank properly.
Overheating these cars is a big no-no as with any. If it does start overheating, turn it off, don't "try" to make it home or around the corner etc. Seen too many failures due to cracked heads etc.
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