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Don't have a fear like that. It takes running the car for longer periods of time to damage the engine. Sustained overheating. They are very reliable engines.
+1 these are very reliable.
After driving it for a bit, lets say a few hundred miles and find no oil in coolant or vice versa, then the engine is fine imho. OP, you can always pull out the plugs and see what they look like, see the internal with borescope etc if that makes you feel better.