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This would have caused the engine to overheat instantly, as water and pressure constantly leak. That's the last stage. My views: 6 liter depletion isn't normal and you would have felt it much earlier before this car switching-off episode. Something is leaking through the radiator or its hoses for sure. Car switched off is the last stage and Im afraid and sorry to say that most likely 9 out 10 times with full engine overheat, the head gasket goes instantly. Probably you might be lucky as you were at slow-moving speed and not on highway or off-road. Don't drive the car until you can get hold of a good mechanic available to minimize the extent of damage (if it's done). Get the coolant pressure check. Get compression test of all cyl, that can 100% tell the engine health. If variance of more than 10-15% in any cyl. surely head gasket is gone. All cyl should read above 120 PSI or Google Patrol compression number to cross-check.