Lubricating oil composition and method for use with low sulfur marine residual fuel

A marine trunk piston engine lubricating oil composition, comprising:

• a) at least 40 wt. % of a Group I base oil and/or a Group II base oil;
• and
• b) 0.1-35 wt. % of detergent, comprising:
• 1) at least one overbased detergent comprising an alkaline earth metal salt of an alkyl-substituted hydroxybenzoic acid, wherein at least 90% of the alkyl groups are C20 or greater;
• and
• 2) at least one non-carbonated, non-overbased detergent comprising an alkaline earth metal salt of an alkyl-substituted hydroxybenzoic acid;
• wherein the marine trunk piston engine lubricating oil composition:
• A) is a medium or high soap formulation that does not contain:
• i) an alkyl-substituted hydroxyaromatic salicylate detergent wherein at least 50% of the alkyl groups by volume are C14-C18;
• ii) a detergent comprising a salt of a sulfonic acid;
• iii) an alkyl phenate detergent;
• and
• iv) any detergent that does not contain a salt of an alkyl-substituted hydroxybenzoic acid;
• and
• B) has at least about 5% less oxidation-based viscosity increase, relative to a lubricating oil composition having no detergent other than a conventional salicylate-based detergent, as measured by a Modified Institute of Petroleum 48 (MIP-48) test.