Diesel in a gasoline car won’t burn, it’ll sit in the sump and exhaust. Happened to me.
Gasoline in a diesel car might very well incinerate the car. Happened to my sister.
Modern cars adjust ignition timing and fuel/air mix to try to optimise economy/power, and that can help the car run a bit longer but they will fail, and pre-ignition in the diesel running on petrol is fairly likely to be catastrophic and life threatening.
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