| abstract |
A cylinder lubricating oil composition for scrubber-equipped crosshead diesel engines, the composition comprising a base oil and (A) a metallic detergent, and having a base number of 15 to 125 mgKOH/g and a kinematic viscosity at 100°C of 10 to 30 mm 2 /s, and satisfying requirement (i) or (ii).n(i) Comprises 0.02 to 5.0 mass% of (B) a demulsifier.n(ii) Comprises, as the component (A), (A1) a Ca phenate detergent and (A2) a metallic detergent other than the Ca phenate detergent, includes, as a nitrogen content, 0.015 mass% or less of (C-1')a succinimide or a borated derivative thereof, the succinimide having in the molecule at least one alkyl group or alkenyl group, or does not include the same, and has a Ph value represented by formula (1) of 20×10 -3 or less.nPh value=C Ca ×2/(r M ×40.08) (1)n(In formula (1), C Ca is the calcium content (mass%) derived from the (A1) component, and r M is the metal ratio of the (A1) component.) |