Abstract: A process for the production of a high viscosity index, low viscosity lubricating base oil having a kinematic viscosity of 3.0 to 5.0 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 using at least one of a heavy gas oil fraction and a light vacuum gas oil fraction as a stock oil that contains about 60% by volmme or more of distillate components within a distillation temperature range of from about 370 to about 480.degree. C. and about 50% by mass or more of saturated hydrocarbons, subjecting the stock oil 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.

Abstract: 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.

Abstract: The disclosure relates to a composition suitable for use in mechanical power transmission devices. It has as its principal component a hydrocarbon oil which has from 19 to 30 carbon atoms, inclusive, and three six-membered carbocyclic rings and consists of a mixture of compounds having the following formula: ##STR1## wherein R.sup.1 is a divalent straight or branched chain radical C.sub.y H.sub.2y where y is an integer of 1 through 3; R.sup.2 is a straight chain radical C.sub.z H.sub.2z where z is an integer of 1 through 3; R.sup.3, R.sup.4, and R.sup.