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Abstract

The invention concerns a lubricant for a two-stroke slow speed crosshead marine engine, powered with a fuel with sulfur content not less than 1%, consisting of a mixture of distillates used as lubricating bases containing x wt. % of dispersing additive of the succinimide type, y wt. % of an overbased detergent additive of the sulfonate type, and z wt. % of an overbased detergent additive of the phenate type. The invention is characterized in that x, y and z are selected in the intervals 0.5.ltoreq.x.ltoreq.2.5, 2.5.ltoreq.y.ltoreq.10 and 11.ltoreq.z.ltoreq.24.5 such that 15.ltoreq.x+y+z.ltoreq.36 and 1.5.ltoreq.y/x.ltoreq.13, the BN of the lubricant, determined according to the ASTM D-2896 standard, is not less than 70 mg KOH/g, and the speed at which sulfuric acid is neutralized by the lubricant, defined by the maximum speed of pressure increase of a closed chamber, with its walls covered with a film of said lubricant from 80 to 100 .mu.m thick, maintained at 100.degree. C., wherein is introduced a known amount of sulfuric acid, has a value not less than 11.times.10.sup.2 Pa/s at 100.degree. C.

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First Claim