A multifunctional, high-performance
hydrocarbon composition is demanded. Concretely, a
metalworking oil composition having high workability even under a severer lubricating condition while resisting to
high productivity, and further capable of suppressing deterioration of working environments or degradation of quality of a product without rise of
lubricant cost, a
metalworking oil composition for minimal quantitative
lubrication system, which is excellent in characteristics as a water-insoluble
lubricant for nonferrous
metalworking and also in characteristics as a
lubricant for
cutting /
grinding by minimal quantitative
lubrication method, and can attain improvement in working efficiency and a further extended tool life, an
electric discharge machining oil improved in working environments such as
odor or
skin roughness and further improved in
processing rate, particularly
processing rate in high-level finish, a
rust preventing oil composition improved in resin compatibility, and a detergent excellent in adaptability with organic material are demanded.Therefore, metalworking oil which contains, as
hydrocarbon base oil,
hydrocarbon base oil having a density at 15° C. of 0.7 to 0.8 g / cm3, and including a n-paraffin content of 10 to 90% by
mass, an aromatic content of 0 to 3% by volume, and a naphthene content of 0 to 20% by volume, a metalworking oil including the above-mentioned
base oil and ester oil, and
electric discharge machining oil,
rust preventing oil, and a detergent composition including the above-mentioned base oil are provided.