A tractor hydraulic fluid composition comprising: (a) a major amount of an oil of lubricating viscosity; (b) a detergent composition comprising (i) at least one neutral or low overbased alkaryl sulfonate calcium salt, wherein the alkaryl group is an aryl group substituted with an alkyl group derived from propylene or isobutylene oligomers; and (ii) at least one neutral or low overbased alkaryl sulfonate calcium salt, wherein the alkaryl group is an aryl group substituted with an alkyl group derived from at least one normal alpha olefin or an isomerized normal alpha olefin, said olefin having from 18 to 30 carbon atoms; (c) at least one hydrocarbyl polyalcohol, wherein the at least one hydrocarbyl polyalcohol is (a) 0.01 to 5 weight percent of the tractor hydraulic fluid composition and (b) not glycerol; and (d) at least one zinc dialkyl dithiophosphate having secondary alkyl groups; wherein the phosphorus content from the at least one zinc dialkyl dithiophosphate having secondary alkyl groups is at least 30 weight percent of the phosphorus content derived from all zinc dialkyl dithiophosphate present in the tractor hydraulic fluid composition; wherein the term "low overbased" refers to overbased salts having a total base number of less than 200; wherein the calcium content of all of the at least one neutral or low overbased alkaryl sulfonate calcium salt having an alkaryl group that is an aryl group substituted with an alkyl group derived from propylene or isobutylene oligomers present in the oil composition is 0.001 to 0.4 weight percent of the tractor hydraulic fluid composition; and wherein total base number is as determined by ASTM Test No. D2896. (a) a major amount of an oil of lubricating viscosity; (b) a detergent composition comprising (i) at least one neutral or low overbased alkaryl sulfonate calcium salt, wherein the alkaryl group is an aryl group substituted with an alkyl group derived from propylene or isobutylene oligomers; and (ii) at least one neutral or low overbased alkaryl sulfonate calcium salt, wherein the alkaryl group is an aryl group substituted with an alkyl group derived from at least one normal alpha olefin or an isomerized normal alpha olefin, said olefin having from 18 to 30 carbon atoms; (i) at least one neutral or low overbased alkaryl sulfonate calcium salt, wherein the alkaryl group is an aryl group substituted with an alkyl group derived from propylene or isobutylene oligomers; and (ii) at least one neutral or low overbased alkaryl sulfonate calcium salt, wherein the alkaryl group is an aryl group substituted with an alkyl group derived from at least one normal alpha olefin or an isomerized normal alpha olefin, said olefin having from 18 to 30 carbon atoms; (c) at least one hydrocarbyl polyalcohol, wherein the at least one hydrocarbyl polyalcohol is (a) 0.01 to 5 weight percent of the tractor hydraulic fluid composition and (b) not glycerol; and wherein the at least one hydrocarbyl polyalcohol is (a) 0.01 to 5 weight percent of the tractor hydraulic fluid composition and (b) not glycerol; and (d) at least one zinc dialkyl dithiophosphate having secondary alkyl groups; wherein the phosphorus content from the at least one zinc dialkyl dithiophosphate having secondary alkyl groups is at least 30 weight percent of the phosphorus content derived from all zinc dialkyl dithiophosphate present in the tractor hydraulic fluid composition; wherein the phosphorus content from the at least one zinc dialkyl dithiophosphate having secondary alkyl groups is at least 30 weight percent of the phosphorus content derived from all zinc dialkyl dithiophosphate present in the tractor hydraulic fluid composition;