A marine system oil composition, comprising: a) a major amount of a base oil of lubricating viscosity; and b) between 0.25 wt. % and 5 wt. %, relative to the total weight of the marine system oil composition, of an overbased metal salt of a carboxylate-containing detergent comprising the overbased salt of at least one alkyl-substituted hydroxyaromatic carboxylic acid prepared by the process comprising: reacting a mixture containing: i) at least one alkyl-substituted hydroxyaromatic carboxylic acid, wherein at least 50 mole % of the alkyl groups on the at least one alkyl-substituted hydroxyaromatic carboxylic acid are C 20 or greater; and ii) a base; and iii) further reacting with at least one overbasing compound in the presence of a further base to provide the overbased salt of the at least one alkyl-substituted hydroxyaromatic carboxylic acid; or reacting a mixture containing: i) at least one alkyl-substituted hydroxyaromatic carboxylic acid, wherein at least 50 mole % of the alkyl groups on the at least one alkyl-substituted hydroxyaromatic carboxylic acid are C 20 or greater; ii) a base; and iii) at least one overbasing compound; wherein the system oil composition has a TBN in the range of between 3.5 to 10 mg KOH/g as measured in accordance with ASTM D2896. a) a major amount of a base oil of lubricating viscosity; and b) between 0.25 wt. % and 5 wt. %, relative to the total weight of the marine system oil composition, of an overbased metal salt of a carboxylate-containing detergent comprising the overbased salt of at least one alkyl-substituted hydroxyaromatic carboxylic acid prepared by the process comprising: reacting a mixture containing: i) at least one alkyl-substituted hydroxyaromatic carboxylic acid, wherein at least 50 mole % of the alkyl groups on the at least one alkyl-substituted hydroxyaromatic carboxylic acid are C 20 or greater; and ii) a base; and iii) further reacting with at least one overbasing compound in the presence of a further base to provide the overbased salt of the at least one alkyl-substituted hydroxyaromatic carboxylic acid; or reacting a mixture containing: i) at least one alkyl-substituted hydroxyaromatic carboxylic acid, wherein at least 50 mole % of the alkyl groups on the at least one alkyl-substituted hydroxyaromatic carboxylic acid are C 20 or greater; ii) a base; and iii) at least one overbasing compound; reacting a mixture containing: i) at least one alkyl-substituted hydroxyaromatic carboxylic acid, wherein at least 50 mole % of the alkyl groups on the at least one alkyl-substituted hydroxyaromatic carboxylic acid are C 20 or greater; and ii) a base; and iii) further reacting with at least one overbasing compound in the presence of a further base to provide the overbased salt of the at least one alkyl-substituted hydroxyaromatic carboxylic acid; or i) at least one alkyl-substituted hydroxyaromatic carboxylic acid, wherein at least 50 mole % of the alkyl groups on the at least one alkyl-substituted hydroxyaromatic carboxylic acid are C 20 or greater; and ii) a base; and iii) further reacting with at least one overbasing compound in the presence of a further base to provide the overbased salt of the at least one alkyl-substituted hydroxyaromatic carboxylic acid; or reacting a mixture containing: i) at least one alkyl-substituted hydroxyaromatic carboxylic acid, wherein at least 50 mole % of the alkyl groups on the at least one alkyl-substituted hydroxyaromatic carboxylic acid are C 20 or greater; ii) a base; and iii) at least one overbasing compound; i) at least one alkyl-substituted hydroxyaromatic carboxylic acid, wherein at least 50 mole % of the alkyl groups on the at least one alkyl-substituted hydroxyaromatic carboxylic acid are C 20 or greater; ii) a base; and iii) at least one overbasing compound;