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Oils are generally classified as refined and
synthetic. Paraffinic and naphthenic oils are refined from
crude oil while synthetic oils are manufactured. Literature
on lubrication frequently makes references to longchain
molecules and ring structures in connection with paraffinic
and naphthenic oils, respectively. These terms refer to the
arrangement of hydrogen and carbon atoms that make up the
molecular structure of the oils. Discussion of the chemical
structure of oils is beyond the scope of this webpage.
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