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Lubricating oils (petroleum), used, noncatalytically refined is a complex combination of hydrocarbons obtained by refining waste oils without catalytic treatment with hydrogen. It consists predominantly of hydrocarbons having carbon numbers predominantly in the range of C20 through C50 and produces a finished oil with a viscosity of at least 100 SUS at 104.degree.F (19cSt at 40.degree.C).