It won't run. Diesel is ignited by compressing the vaporized fuel much higher than a gasoline (petrol) engine. A SMALL amount will result in very poor performance.
What happens is you must remove the petrol immediately. Petrol or gasoline will destroy a diesel engine.
If you put petrol in a diesel vehicle do not start the engine. Petrol will do serious damage to a diesel engine. You must drain all the petrol out and flush the fuel lines.
It will dirty the injectors a bit and run very rough,if at all. Still, not as bad as putting petrol into a diesel engine .
No, diesel engine require diesel fuel. Put petrol in a diesel engine and you will destroy it.
I would recommend not running the engine until the fuel is drained. Any amount of petrol/gasoline in a diesel can cause engine or fuel system damage.
Gasoline in a Diesel vehicle will do some serious damage to the engine.
Yes, petrol/gasoline will severely damage a diesel engine.
Not if you want it to run.
Who told you it is harmful? It is only harmful if it is a Diesel engine. If it is a petrol (gasoline) engine then Petrol is what it takes to run.
No
Yes, never put oil formulated for a diesel in a gasoline engine.
The petrol engine will just not run. No damage will be done. You will need to drain the tank, flush the fuel lines, and replace the fuel filter.