A detergent for use in a lubricating oil

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A detergent comprising one or more neutral or overbased alkaline earth metal C10 to C40 hydrocarbyl substituted hydroxybenzoates, wherein : (i) the one or more neutral or overbased alkaline earth metal C10 to C40 hydrocarbyl substituted hydroxybenzoates comprises one or more C10 to C40 hydrocarb-1-yl substituted hydroxybenzoates; or, greater than 50 mole % of the one or more neutral or overbased alkaline earth metal C10 to C40 hydrocarbyl substituted hydroxybenzoates, based on the total number of moles of said C10 to C40 hydrocarbyl substituted hydroxybenzoates, comprises one or more C10 to C40 hydrocarb-2-yl substituted hydroxybenzoates. The alkaline earth metal hydrocarbyl substituted hydroxybenzoates may be hydrocarbyl substituted calcium salicylates.