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I don't think there necessarily had to be something wrong with the car prior to leaving it idling for 3 hours.
Even my car in good condition gets a little warmer than usual if Im sitting dead still for like 10 minutes in heavy traffic.
Car probably got messed up because it was just heatsoaked for hours with no air-flow, especially if its turbo...
I think blown head-gasket from being overheated for so long. Check compression like everyone else already said.
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