A low sulfur marine distillate fuel trunk piston diesel engine lubricating oil composition comprising: (a) a major amount of a Group I base oil and/or a Group II base oil; (b) a detergent composition comprising: a medium overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C 20 or greater, and wherein the TBN of the medium overbased detergent on an actives basis is from 100 to 300mg KOH/g; a high overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C 20 or greater, and wherein the TBN of the high overbased detergent on an actives basis is greater than 300 mg KOH/g; wherein the ratio of weight % medium overbased detergent to weight % high overbased detergent is from 0.1:1 to 10: 1; wherein the TBN of the lubricating oil composition is from 6 to 20 mg KOH/g; wherein the lubricating oil composition does not contain: (i) an overbased detergent comprising a salt of an alkyl-substituted hydroxybenzoic acid having at least 50 mole % of alkyl groups that are C 14 -C 18 ; and (ii) a detergent comprising sulfurized metal alkyl phenate, and wherein the detergent composition contains no detergent that does not contain a salt of an alkyl-substituted hydroxybenzoic acid, and wherein TBN is measured in accordance with ASTM Standard No. D2896. (a) a major amount of a Group I base oil and/or a Group II base oil; (b) a detergent composition comprising: a medium overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C 20 or greater, and wherein the TBN of the medium overbased detergent on an actives basis is from 100 to 300mg KOH/g; a high overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C 20 or greater, and wherein the TBN of the high overbased detergent on an actives basis is greater than 300 mg KOH/g; a medium overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C 20 or greater, and wherein the TBN of the medium overbased detergent on an actives basis is from 100 to 300mg KOH/g; a high overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C 20 or greater, and wherein the TBN of the high overbased detergent on an actives basis is greater than 300 mg KOH/g; wherein the ratio of weight % medium overbased detergent to weight % high overbased detergent is from 0.1:1 to 10: 1; wherein the TBN of the lubricating oil composition is from 6 to 20 mg KOH/g; wherein the lubricating oil composition does not contain: (i) an overbased detergent comprising a salt of an alkyl-substituted hydroxybenzoic acid having at least 50 mole % of alkyl groups that are C 14 -C 18 ; and (ii) a detergent comprising sulfurized metal alkyl phenate, and (i) an overbased detergent comprising a salt of an alkyl-substituted hydroxybenzoic acid having at least 50 mole % of alkyl groups that are C 14 -C 18 ; and (ii) a detergent comprising sulfurized metal alkyl phenate, and wherein the detergent composition contains no detergent that does not contain a salt of an alkyl-substituted hydroxybenzoic acid, and wherein TBN is measured in accordance with ASTM Standard No. D2896. <EOS>