Lubricant for the cylinder lubrication of low-speed two-stroke marine diesel engines using fuels from 1 to 3.5% of sulphur content. Formulated with high viscosity (20 cSt at 100ºC) premium base oils and very high detergency (TBN 70) which allows the optimization of the oil distribution and maintains a stable and continuous lubricating film. Its additives are carefully selected to provide excellent ring and liner wear protection, piston cleanliness and superior protection against corrosive acids.