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Q6.  Discuss the importance of correct cylinder lubrication in a large diesel engine, explaining the possible consequences of both over and under lubrication.  Describe the qualities required in a cylinder lubricant for use in an engine burning high viscosity (heavy) fuel oil.  Comment on the timing of the injection of the lubricant in relation to the working cycle of the engine. Changes, if any, in the quality of the cylinder lubricating oil used for a large arrange diesel engine, with the imposition of Annex IV of MARPOL