get the key silly
Running an engine with no oil in it.
If they dissolved they would plug up the fuel filter.
Lack of water in you engine block. Lack of oil in your engine block. Can cause piston siege.
It locks up the engine and ruins it
vapor lock happens the fuel boils in the line, maybe the line is too close to the engine, try putting foil around it.
The engine could be locking due to piston pressure. If the spark plugs are removed and the engine still locks, then something internal has broken and the engine needs to be inspected to see what snapped.
Its going to tear up the engine
You freeze up the engine
If engine is truly locked up putting fresh oil in it will not work. The engine locks up because the bearings are seized on the rotating assemblies. A complete rebuild will be needed
Until the engine self destructs and locks up. You do not drive a car with a leaking head gasket unless you want to destroy the engine. STOP running this engine until it can be repaired.
the engine locks up at about 50 or 60km and sometimes it doesn't unlock. you have to take out that sensor I believe it's the torque converter.