High viscous, high-performance lubricant oil formulated from selected paraffinic base oils and specific additives that quickly emulsifies in presence of sea water, maintaining stable the emulsion. The product has excellent lubrication properties and protects critical surfaces of the stern tube from corrosion, even during long periods of time working in severe operating conditions. Specially recommended for stern tube bearings/closures, where emulsifying lubricants are necessary. It is especially developed to lubricate Cedervall type stern tubes installed in vessels and for certain fin stabilizer bearings installed in passenger ships