Medium and large merchant vessels use oil-lubricated shafting and bearings in the sterntube. Oil leakage from the sterntube is a serious environmental issue in these vessels. In this paper a newly developed, environmentally compatible lubricant for such sterntube systems is outlined. Properties required for a sterntube lubricant and a suitable base fluid are discussed Environmental properties, viscosity, corrosion prevention, water contamination lubrication and seal compatibility of the new lubricant are described.

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