Aliphatic tetrahedral borate compounds for fully formulated lubricating compositions

A fully-formulated lubricating composition comprising:

• an oil of lubricating viscosity;
• an ionic tetrahedral borate compound including:
• a tetrahedral borate anion having a boron atom with two bidentate di-oxo ligands both being a linear C18-tartrimide,
• a first dispersant comprising a conventional ammonium substituted polyisobutenyl succinimide compound having a polyisobutenyl number average molecular weight of 750 to 2,500, and
• a second dispersant comprising an ammonium substituted polyisobutenyl succinimde compound having an N:CO ratio of 1.8 and a polyisobutylenyl number average molecular weight of 750 to 2,500;
• wherein one or more of the first dispersant and the second dispersant are in cationic form;
• a third polyisobutenylsuccinimide dispersant;
• an overbased metal-containing detergent selected from the group consisting of an alkaline earth metal sulfonate, a phenate and a salicylate;
• a zinc dialkyldithiophosphate;
• an ashless antioxidant;
• and
• a performance additive selected from the group consisting of a viscosity modifier, an extreme pressure agent, a foam inhibitor, a corrosion inhibitor, a pour point depressant, a friction modifier, a demulsifier, and a seal swell agent.

A method of lubricating an internal combustion engine, comprising:

• supplying a fully-formulated lubricating composition to a lubricating system of the engine, the fully-formulated lubricating composition including:
• an oil of lubricating viscosity;
• an ionic tetrahedral borate compound including:
• a tetrahedral borate anion having a boron atom with two bidentate di-oxo ligands both being a linear C18-tartrimide;
• a first dispersant comprising a conventional ammonium substituted polyisobutenyl succinimide compound having a polyisobutenyl number average molecular weight of 750 to 2,500;
• a second dispersant comprising an ammonium substituted polyisobutenyl succinimde compound having an N:CO ratio of 1.8 and a polyisobutylenyl number average molecular weight of 750 to 2,500,
• wherein one or more of the first dispersant and the second dispersant are in cationic form;
• and
• a performance additive selected from the group consisting of a detergent, an antioxidant, a dispersant, an anti-wear agent, a viscosity modifier, an extreme pressure agent, a foam inhibitor, a corrosion inhibitor, a pour point depressant, a friction modifier, a demulsifier, and a seal swell agent.