The disclosed technology relates to compositions suitable for use as lubricants and lubricant additive compositions which comprise a 1,4-benzoxazine-derived antioxidant, wherein the antioxidant itself may also be described as a 1,4-benzoxazine compound, and optionally comprising other additives suitable for lubricants, such as an anti-wear agent, a detergent, or a dispersant.

A viscosity index improver (VII) or viscosity modifier (VM) concentrate comprising: from about 60 parts to about 95 parts of a diluent oil; and from about 5 parts to about 40 parts of star diblock and triblock copolymers characterized by the formula:

(D-PA-D)n-X and linear diblock and triblock copolymers characterized by the formula:

D-PA-D wherein D represents a block derived from at least one diene; PA represents a block derived from monoalkenyl arene; D represents a block derived from at least one diene; n represents the average number of arms per star diblock and triblock polymer formed by the reaction of 2 or more moles of a polyalkenyl coupling agent per mole of arms; X represents a nucleus of a polyalkenyl coupling agent; and n has a value from about 4 to about 25; PA has a number average molecular weight from about 10,000 Daltons to about 35,000 Daltons; D has a number average molecular weight from about 20,000 Daltons to about 55,000 Daltons; D has a number average molecular weight of about 15,000 Daltons or less; a ratio of the number average molecular weight of D to the number average molecular weight of D is about 2.5:1 or greater; a ratio of the number average molecular weight of PA to the number average molecular weight of D is about 1:1 or greater; the star diblock and triblock copolymers have a coupling efficiency greater than about 50%; the concentrate comprises at least 50 wt % of the diluent oil and from about 6.0 wt. % to about 14.0 wt. % of the star and linear diblock and triblock copolymers. The diblock and triblock copolymers possess the ability to thicken in concentrates without gelation or slow flowing material, relatively uniformly across different types or Groups of base stocks/diluents, at high active ingredient concentrations and handling temperatures.

A viscosity index improver (VII) or viscosity modifier (VM) concentrate comprising: from about 60 parts to about 95 parts of a diluent oil; and from about 5 parts to about 40 parts of star diblock and triblock copolymers characterized by the formula:

(D-PA-D)n-X and linear diblock and triblock copolymers characterized by the formula:

D-PA-D wherein D represents a block derived from at least one diene; PA represents a block derived from monoalkenyl arene; D represents a block derived from at least one diene; n represents the average number of arms per star diblock and triblock polymer formed by the reaction of 2 or more moles of a polyalkenyl coupling agent per mole of arms; X represents a nucleus of a polyalkenyl coupling agent; and n has a value from about 4 to about 25; PA has a number average molecular weight from about 10,000 Daltons to about 35,000 Daltons; D has a number average molecular weight from about 20,000 Daltons to about 55,000 Daltons; D has a number average molecular weight of about 15,000 Daltons or less; a ratio of the number average molecular weight of D to the number average molecular weight of D is about 2.5:1 or greater; a ratio of the number average molecular weight of PA to the number average molecular weight of D is about 1:1 or greater; the star diblock and triblock copolymers have a coupling efficiency greater than about 50%; the concentrate comprises at least 50 wt % of the diluent oil and from about 6.0 wt. % to about 14.0 wt. % of the star and linear diblock and triblock copolymers. The diblock and triblock copolymers possess the ability to thicken in concentrates without gelation or slow flowing material, relatively uniformly across different types or Groups of base stocks/diluents, at high active ingredient concentrations and handling temperatures.