Method of producing lube base oil and lube base oil produced thereby

A method of producing a lube base oil mixture, the method comprising:

• providing a waste lubricant-derived refined oil fraction derived from a waste lubricant comprising a lube base oil of API Group I or II, wherein the waste lubricant-derived refined oil fraction comprises a vacuum ionic refined oil, a first regenerated base oil, or a combination thereof;
• dewaxing the waste lubricant-derived refined oil fraction to produce a second regenerated base oil;
• and
• blending the second regenerated base oil with a separate lube base oil to produce a lube base oil mixture of Group III or higher,
• wherein the separate lube base oil has a kinematic viscosity at 100° C. of 6 to 7 cSt, a viscosity index of 120 or more, a pour point of −10° C. or less, and a cold crank simulator (CCS) viscosity at −30° C. of 5400 cP or less.

A method of producing a lube base oil mixture, the method comprising:

• subjecting an ionic refined oil to a vacuum distillation to obtain a vacuum ionic refined oil;
• mixing the vacuum ionic refined oil with a first regenerated base oil to make a waste lubricant-derived refined oil fraction;
• dewaxing the waste lubricant-derived refined oil fraction to produce a second regenerated base oil;
• and
• blending the second regenerated base oil with a separate lube base oil to produce a lube base oil mixture of Group III or higher.