Lubricating composition for a marine engine or a stationary engine

A lubricant composition comprising:

• at least one base oil selected from the group consisting of oils of the group I, oils of the group II and mixtures thereof, according to the classes defined in the API classification;
• at least one detergent, in an amount being from 10% to 20% by mass based on the total mass of said lubricant composition;
• at least one olefin copolymer;
• and
• at least one hydrogenated and linear styrene/butadiene copolymer;
• wherein said at least one detergent is selected from the group consisting of alkaline or alkaline-earth of carboxylate and phenate detergents,
• wherein the amount of olefin copolymer is from 0.01 to 5% by mass and the amount of styrene/butadiene copolymer is from 2 to 8% by mass,
• wherein said at least one olefin copolymer is an ethylene-propylene copolymer and comprises a content of ethylene units ranging from 30% to 80% by mass based on the mass of copolymer olefin, and
• wherein in the hydrogenated and linear styrene/butadiene copolymer, the content of hydrogenated butadiene units ranges from 50% to 98% by moles, as compared with the number of moles of hydrogenated and linear styrene/butadiene copolymer.