Light Diesel Oil : Two main grades of Light diesel fuel are marketed, High Speed Diesel (HSD) and Light diesel oil (LDO). The former is a 100% distillate fuel while the latter is a blend of distillate fuel with a small proportion of residual fuel It is marketed under BIS 1460-2000 specification for Diesel fuels. Whereas HSD is used as a fuel for high-speed engines having 750 RPM and above in most of the prime movers used, LDO is used in lower RPM engines..
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