Diesel fuel is often used in diesel engines. Diesel engines or compression ignition engines, rely on the temperature increase of
compression, rather than on spark plugs, to achieve reliable ignition timing and combustion efficiency.
As a result of their inherently higher compression ratio for a given power output, diesel engines are more fuel efficient than
spark ignition engines. Compared with spark ignition automotive engines, diesel engines weigh more, generate more vibration and
produce greater particulate or soot emissions. Diesel engines can also produce a particularly carcinogenic type of hydrocarbon
pollutant known as polycyclic aromatic hydrocarbons (PAHs), which are generated during the diesel combustion process.
The cetane index is a measure of the autoignition quality of a diesel fuel, with higher numbers meaning that the engine is easier
to start in cold weather.
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