Mitsubishi Oil Co., Ltd.

Motohiko Iwata

Tetsuo Takito

Yasuo Kinoshita

Yuji Yoshizumi

A process for the production of a high viscosity index, low viscosity lubricating base oil having a kinematic viscosity of 3.0 to 7.5 mm.sup.2 /s at 100.degree. C., a viscosity index of 120 or more and a pour point of -10.degree. C. or less, while simultaneously producing a high quality fuel oil, which includes subjecting a mixture stock oil of (a) at least one of a heavy gas oil fraction and a vacuum gas oil fraction and (b) a slack wax to hydrocracking in the presence of an amorphous silica alumina catalyst, separating the cracked product into a fuel oil fraction and a lubricating oil fraction by atmospheric distillation, and subsequently subjecting the lubricating oil fraction to dewaxing, optionally applying at least one of solvent refining and hydrofinishing.

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Tokyo, Japan

Motohiko Iwata