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The main reason is that the way Diesel and Gasoline engines works is complete different, the gasoline needs a spark to explode and generate movement. The diesel explodes with pressure, the pressure of the fuel on the cylinder is what makes the explosion, so in a diesel engine you don't need an electric system to generate a spark.

The compression in a diesel engine is a lot higher that a gasoline engine.

All diesel engines have diesel injectors, gasoline engine works with injectors and carburators.

Because of all this differences and more the maintanence is different, oil change periods, air filters, fuel system, electric system, belts, valves.........

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Q: How is maintenance different for a gasoline and diesel cars?
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