This invention relates to a lubricating oil composition for ammonia fueled internal combustion engines (AICE) including: a) an oil of lubricating viscosity at greater than 50 wt. % of the composition comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; b) optionally, one or more, optionally borated, higher molecular weight polyisobutylene succinimide (PIBSA-PAM) dispersant (Mn 1600 g/mol or more); c) one or more, optionally borated, lower molecular weight polyisobutylene succinimide (PIBSA-PAM) dispersant (Mn less than 1600 g/mol), wherein the treat level of the combination of the higher molecular weight PIBSA-PAM and lower molecular weight PIBSA-PAM is from 2.5 to 12.0 wt. % of the composition, wherein the treat level of the lower molecular weight PIBSA-PAM is from 0.1 to 9.0 wt. % of the composition, and wherein the treat level of the higher molecular weight PIBSA-PAM is less than or equal to 3.0 wt. %; and d) one or more overbased detergents selected from the group consisting of a metal salicylate, a metal carboxylate, a mixture of a metal salicylate and a metal sulfonate, a mixture of a metal carboxylate and a metal sulfonate, and combinations thereof, wherein the one or more overbased detergents have a Total Base Number (mgKOH/g) greater than or equal to 9 and less than or equal to 500 and deliver at least 5 mmol of total soap to the composition; and e) one or more zinc dialkyl dithiophosphate (ZDDP) compounds at from about 0.08 wt. % to about 2.0 wt. % of the lubricating oil composition. The lubricating oil composition has a total sulfated ash of less than or equal to 5.0 wt. %, and a total phosphorous level of less than or equal to 0.120 wt. %, and a viscosity of less than or equal to 25 cSt (KV100). The lubricating oil composition upon exposure to ammonia contamination per the NOx-Ammonia exposure protocol results in a decrease in MCT performance rating of less than or equal to 4.0 merits. Also provided is a concentrate for use in a lubricating oil for an AICE and a method of improving engine cleanliness in an AICE.

This invention relates to a lubricating oil composition for hybrid engines including a) an oil of lubricating viscosity at greater than 50 wt. % of the composition comprising a Group I, II, III or IV base oil, or combinations thereof; b) one or more, optionally borated, higher molecular weight polyisobutylene succinimide (PIBSA-PAM) dispersant (Mn 1600 g/mol or more); c) optionally one or more, optionally borated, lower molecular weight polyisobutylene succinimide (PIBSA-PAM) dispersant (Mn less than 1600 g/mol), wherein the treat level of the combination of the higher molecular weight PIBSA-PAM and lower molecular weight PIBSA-PAM is from 1.0 to 12.0 wt. % of the composition, and wherein the treat level of the higher molecular weight PIBSA-PAM is from 1.0 to 9.0 wt. % of the composition; and d) an overbased calcium salicylate or sulfonate detergent, an overbased magnesium salicylate or sulfonate detergent, an overbased mixed calcium and magnesium salicylate or sulfonate detergent or a combination thereof, wherein the detergent has a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and delivers at least 5 mmol of total soap to the composition. Also provided is a method of evaluating a lubricating oil composition for ranking its performance in a hybrid engine by running a bench scale test protocol based upon 3 test results: the emulsion dispersion and stability performance at all 4 test conditions in the Emulsion Stability test (modified ASTM D7563), the emulsion corrosion test, and the journal bearing wear test.

This invention relates to a lubricating oil composition for hybrid engines including a) an oil of lubricating viscosity at greater than 50 wt. % of the composition comprising a Group I, II, III or IV base oil, or combinations thereof; b) one or more, optionally borated, higher molecular weight polyisobutylene succinimide (PIBSA-PAM) dispersant (Mn 1600 g/mol or more); c) optionally one or more, optionally borated, lower molecular weight polyisobutylene succinimide (PIBSA-PAM) dispersant (Mn less than 1600 g/mol), wherein the treat level of the combination of the higher molecular weight PIBSA-PAM and lower molecular weight PIBSA-PAM is from 1.0 to 12.0 wt. % of the composition, and wherein the treat level of the higher molecular weight PIBSA-PAM is from 1.0 to 9.0 wt. % of the composition; and d) an overbased calcium salicylate or sulfonate detergent, an overbased magnesium salicylate or sulfonate detergent, an overbased mixed calcium and magnesium salicylate or sulfonate detergent or a combination thereof, wherein the detergent has a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and delivers at least 5 mmol of total soap to the composition. Also provided is a method of evaluating a lubricating oil composition for ranking its performance in a hybrid engine by running a bench scale test protocol based upon 3 test results: the emulsion dispersion and stability performance at all 4 test conditions in the Emulsion Stability test (modified ASTM D7563), the emulsion corrosion test, and the journal bearing wear test.

This disclosure relates to the use of di(alkyl substituted phenyl)amine antioxidants as additives in lubricant compositions having good oxidation properties in engine crankcase applications, especially in compression ignited engine and or spark ignited engine applications, where the antioxidant comprises from 0 to 15 mass % of mono-C.sub.9-alkyl substituted diphenyl amine and tri-C.sub.9-alkyl substituted diphenyl amine, and 85 to 100 mass % di-C.sub.9-alkyl substituted phenyl amines based upon the weight of the mono-, di- and tri-C.sub.9-alkyl substituted phenyl amines.

This disclosure relates to the use of di(alkyl substituted phenyl)amine antioxidants as additives in lubricant compositions having good oxidation properties in engine crankcase applications, especially in compression ignited engine and or spark ignited engine applications, where the antioxidant comprises from 0 to 15 mass % of mono-C.sub.9-alkyl substituted diphenyl amine and tri-C.sub.9-alkyl substituted diphenyl amine, and 85 to 100 mass % di-C.sub.9-alkyl substituted phenyl amines based upon the weight of the mono-, di- and tri-C.sub.9-alkyl substituted phenyl amines.

An electric motor lubricating fluid for an electric motor system including a lubricating base oil, a tolyltriazole corrosion inhibitor, an oil-soluble phosphorus antiwear additive, and a sulfonate detergent in amounts to facilitate effective performance in copper leaching and extreme pressure scuffing when in the presence of the tolyltriazole.

An electric motor lubricating fluid for an electric motor system including a lubricating base oil, a tolyltriazole corrosion inhibitor, an oil-soluble phosphorus antiwear additive, and a sulfonate detergent in amounts to facilitate effective performance in copper leaching and extreme pressure scuffing when in the presence of the tolyltriazole.