A lubricating composition includes an oil of lubricating viscosity and a compound comprising a protected mercaptophenol. The protected mercaptophenol includes a mercapto group in which the hydrogen is substituted with a substituent of at least 5 carbons. The substituent is selected from hydroxy-substituted hydrocarbyl groups, poly(ether) groups, hydrocarbyl groups, and mixtures and salts thereof.

The disclosed technology relates to the use of toxicologically acceptable hydrocarbyl- (e.g. alkyl-) phenol detergents and their salts in automotive lubricating oils, such as, for example, automatic or manual transmissions.

The disclosed technology relates to the use of toxicologically acceptable hydrocarbyl- (e.g. alkyl-) phenol detergents and their salts in automotive lubricating oils, such as, for example, automatic or manual transmissions.

A lubricating composition includes at least one base oil, at least one borated dispersant, at least two antioxidants selected from amine antioxidants, phenolic antioxidants substituted with one or more linear or branched alkyl groups having from 1 to 30 carbon atoms, and mixtures thereof, and at least one phosphite polymer having the formula (I) wherein: each of the R.sup.1, R.sup.2, R.sup.3 and R.sup.4 can be independently selected from the C1-C20 alkyl, C3-C22 alkenyl, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers and YOH groups; Y is selected from C2-C40 alkylene, C2-C40 alkyl lactone, R.sup.7N(R.sup.8)R.sup.9 groups, in which R.sup.7, R.sup.8 and R.sup.9 are independently selected from hydrogen, C1-C20 alkyl, C3-C22 alkenyi, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers; m is an integer from 2 to 100; n is an integer from 1 to 1000.

A lubricating composition includes at least one base oil, at least one borated dispersant, at least two antioxidants selected from amine antioxidants, phenolic antioxidants substituted with one or more linear or branched alkyl groups having from 1 to 30 carbon atoms, and mixtures thereof, and at least one phosphite polymer having the formula (I) wherein: each of the R.sup.1, R.sup.2, R.sup.3 and R.sup.4 can be independently selected from the C1-C20 alkyl, C3-C22 alkenyl, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers and YOH groups; Y is selected from C2-C40 alkylene, C2-C40 alkyl lactone, R.sup.7N(R.sup.8)R.sup.9 groups, in which R.sup.7, R.sup.8 and R.sup.9 are independently selected from hydrogen, C1-C20 alkyl, C3-C22 alkenyi, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers; m is an integer from 2 to 100; n is an integer from 1 to 1000.

A sulphurised calcium phenate detergent is made by (i) reacting hydrogenated distlled CNSL with a calcium salt and sulphur in the presence of a promoter and process solvent; (ii) reacting the product of (i) with additional calcium salt and promoter, and with a co-surfactant, and then carbonating; and optionally (iii) further carbonating the reaction mixture to obtain overbased sulphurised calcium phenate.

The present disclosure provides a method for preparing a sulfurized alkyl phenate product to achieve a high sulfurization ratio of sulfurized alkyl phenate to unsulfurized alkyl phenate/phenol in the context of a neutralized and optionally overbased additive.

The present disclosure provides a method for preparing a sulfurized alkyl phenate product to achieve a high sulfurization ratio of sulfurized alkyl phenate to unsulfurized alkyl phenate/phenol in the context of a neutralized and optionally overbased additive.