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U.S. goes by Cetane Number of 40 whereas EU follows a Cetane Index of 46 plus a Cetane Number of 51. Other countries either specify Cetane Number or Cetane index, some of them specify both. Cetane Number can be improved by adding chemical additives , the Cetane Index cannot be influenced since its a quality of base fuel.

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Q: What is the international norme for cetane index of diesel fuels?
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