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While FO is used in the DG sets there is no evaluating property like Cetane number or CII. Instead of that, calculated carbon aromaticity index or CCAI is calculated to find out the suitability. It is based on density and viscosity of the fuel. Normally a value between 800 to 860 means good fuel for DG sets while values more than 860 severe indicate unsuitability which may cause engine damage. Lower values than 800 may not be very good but are not as bad as those beyond 860.