| 摘要 |
A treated oil such as a treated heavy oil which has a viscosity, which in lower than the viscosity of the oil prior to the treatment thereof (i.e., the initial oil). The temperature at which 80 mass % of the treated oil has boiled is within 25.degree.C of temperature at which 80 mass % of the oil prior to the treatment thereof has boiled. Thus, the treated oil and the oil prior to the treatment thereof, have distillation curves or boiling point curves which ar e the same as or approximate to each other.
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