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This document discusses the level of BN (base number) and viscosity in the system lube oil of two-stroke crosshead engines during operation. It notes that some cylinder lube oil leaks through the piston rod stuffing box into the system lube oil, increasing its BN and viscosity over time. It states that increases up to a BN of 30 and viscosity from SAE 30 to SAE 40 are considered normal. The document provides background on modern improvements to stuffing box design that reduced lube oil drainage and the effe

Author

florin

Language

EN