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Exhaust Gas Recirculation (EGR) is being used widely to reduce and control the oxides of nitrogen (NOx) emission from diesel engines. EGR controls the NOx because it lowers oxygen concentration and flame temperature of the working fluid in the combustion chamber.
The expected life of a diesel fuel is indicated by the oxidation stability test ASTM D2274. The test measures how much gum and sediment will be deposited after keeping the fuel at. 95Â°C in the presence of oxygen for 16 hours. It roughly corresponds to one year storage at. 25Â°C.