How is gasoline different from diesel, and why does it damage the car if you put the wrong kind in the tank?
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Diesel combusts by compression but it also acts as a lubricant through the diesel system. It is injected into the cylinder under immense pressure.
Petrol requires a source of ignition (spark plug) and also compression, however the compression is considerably lower than a Diesel.
Diesel is oil based, hence its use as a lubrication before it is burned. The pressures required are achieved by a mechanical pump. Petrol is a solvent, running this through said pump can cause premature wear and also damage. (Think of running your engine with no oil in it) moving metal parts against one another require lubrication and cooling!
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