A lubricating oil composition comprising: (a) a major amount of an oil of lubricating viscosity having a kinematic viscosity at 100°C in a range of 2 to 50 mm 2 /s, (b) an overbased metal salt of an alkyl-substituted phenate detergent, wherein the alkyl group is derived from an isomerized normal alpha olefin having from 10 to 40 carbon atoms per molecule and having an isomerization level (I) of the normal alpha olefin of from 0.1 to 0.4, wherein the isomerization level (I) is determined by the method described in the description, (c) one or more boron-containing detergents having 50 to 500 ppm of boron, based on the total weight of the lubricating oil composition, and either (d1) one or more zinc dialkyl dithiophosphate compounds derived from a primary alcohol, or (d2) one or more zinc dialkyl dithiophosphate compounds derived from a primary alcohol and further comprising one or more zinc dialkyl dithiophosphate compounds derived from a secondary alcohol, wherein the molar ratio of the primary alcohol of the one or more zinc dialkyl dithiophosphate compounds derived from a primary alcohol to the secondary alcohol of the one or more zinc dialkyl dithiophosphate compounds derived from a secondary alcohol is from 80:20 to 20:80, and wherein the lubricating oil composition comprises from 10 ppm to 5000 of metal derived from the overbased metal salt of the alkyl-substituted phenate detergent, based on the total weight of the lubricating oil composition and 0.01 wt. % to 0.12 wt. % of phosphorus derived from the one or more zinc dialkyl dithiophosphate compounds, based on the total weight of the lubricating oil composition. (a) a major amount of an oil of lubricating viscosity having a kinematic viscosity at 100°C in a range of 2 to 50 mm 2 /s, (b) an overbased metal salt of an alkyl-substituted phenate detergent, wherein the alkyl group is derived from an isomerized normal alpha olefin having from 10 to 40 carbon atoms per molecule and having an isomerization level (I) of the normal alpha olefin of from 0.1 to 0.4, wherein the isomerization level (I) is determined by the method described in the description, (c) one or more boron-containing detergents having 50 to 500 ppm of boron, based on the total weight of the lubricating oil composition, and either (d1) one or more zinc dialkyl dithiophosphate compounds derived from a primary alcohol, or (d2) one or more zinc dialkyl dithiophosphate compounds derived from a primary alcohol and further comprising one or more zinc dialkyl dithiophosphate compounds derived from a secondary alcohol, wherein the molar ratio of the primary alcohol of the one or more zinc dialkyl dithiophosphate compounds derived from a primary alcohol to the secondary alcohol of the one or more zinc dialkyl dithiophosphate compounds derived from a secondary alcohol is from 80:20 to 20:80, and wherein the lubricating oil composition comprises from 10 ppm to 5000 of metal derived from the overbased metal salt of the alkyl-substituted phenate detergent, based on the total weight of the lubricating oil composition and 0.01 wt. % to 0.12 wt. % of phosphorus derived from the one or more zinc dialkyl dithiophosphate compounds, based on the total weight of the lubricating oil composition. <EOS>