Cylinder lubricant having a BN determined according to standard ASTM D-2986 of greater than or equal to 50 milligrams of potassium hydroxide per gram of lubricant, preferably from 50 to 100 milligrams of potassium hydroxide per gram of lubricant, comprising: • at least one lubricant base oil, • at least one detergent based on alkali metals or alkaline earth metals, overbased with carbonate metal salts, • at least one neutral detergent, • a mixture of fatty amines comprising at least one fatty amine of formula R 1 -[NR 2 (CH 2) 3] 3 -NH 2 in which: • R 1 represents a saturated or unsaturated, linear or branched alkyl group comprising at least 14 carbon atoms, • R 2 represents a hydrogen atom or a -(CH 2) 2 OH group, the content by weight of fatty amine of formula being greater than or equal to 90% relative to the total weight of the mixture of fatty amines, the fatty amine having a BN determined according to standard ASTM D-2986 ranging from 150 to 600 milligrams of potassium hydroxide per gram of amine, preferably 250 to 600 milligrams of potassium hydroxide per gram of amine, the percentage by weight of fatty amine relative to the total weight of the lubricant being chosen such that the BN provided by this compound represents a contribution of at least 10 milligrams of potassium hydroxide per gram of lubricant to the total BN of said cylinder lubricant, preferably a contribution of 10 to 60 milligrams of potassium hydroxide per gram of lubricant, and the percentage by weight of the overbased detergent relative to the total weight of the lubricant being chosen such that the BN provided by the carbonate metal salts represents a contribution of at least 20 milligrams of potassium hydroxide per gram of lubricant to the total BN of said cylinder lubricant. • at least one lubricant base oil, • at least one detergent based on alkali metals or alkaline earth metals, overbased with carbonate metal salts, • at least one neutral detergent, • a mixture of fatty amines comprising at least one fatty amine of formula R 1 -[NR 2 (CH 2) 3] 3 -NH 2 in which: • R 1 represents a saturated or unsaturated, linear or branched alkyl group comprising at least 14 carbon atoms, • R 2 represents a hydrogen atom or a -(CH 2) 2 OH group, the content by weight of fatty amine of formula being greater than or equal to 90% relative to the total weight of the mixture of fatty amines, the fatty amine having a BN determined according to standard ASTM D-2986 ranging from 150 to 600 milligrams of potassium hydroxide per gram of amine, preferably 250 to 600 milligrams of potassium hydroxide per gram of amine, the percentage by weight of fatty amine relative to the total weight of the lubricant being chosen such that the BN provided by this compound represents a contribution of at least 10 milligrams of potassium hydroxide per gram of lubricant to the total BN of said cylinder lubricant, preferably a contribution of 10 to 60 milligrams of potassium hydroxide per gram of lubricant, and the percentage by weight of the overbased detergent relative to the total weight of the lubricant being chosen such that the BN provided by the carbonate metal salts represents a contribution of at least 20 milligrams of potassium hydroxide per gram of lubricant to the total BN of said cylinder lubricant. • R 1 represents a saturated or unsaturated, linear or branched alkyl group comprising at least 14 carbon atoms, • R 2 represents a hydrogen atom or a -(CH 2) 2 OH group,