Most CI engine fuels are obtained in the fractions of etude petroleum near kerosene and gas oil.
These fuels are heavier and more viscous than the gasoline used in the SI engine. Some of the
important characteristics of CI engine fuels are: (a) ignition quality, (b) volatility (c) viscosity,
(d) gravity, (e) corrosion and wear, (f) handling ease, (g) safety, and (h) cleanliness.