I would not take the chance. There are so many things that could go wrong if the head gasket leak gets worse. The coolant could leak into the cylinder and when you try to start it could bend a rod.
The price is not unreasonable. I would have it changed before you leave.
Also, if equipped with Dex-Cool coolant, ask GM if it is covered under warranty. GM recently settled a law suit for head and intake manifold gasket failure related to Dex-Cool.
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Friday, April 30th, 2021 AT 9:15 AM