Hong Kong-headquartered Gulf Oil has deliberately taken a conservative approach to meet the changing circumstances of cylinder liner lubrication, says Don Gregory, director for innovation and technology. “In the 1970s and 1980s, 70BN cylinder oil with a viscosity grade of SAE 50 was the safe traditional solution used by most ships.” Matters changed in the late 1980s and early 1990s when a new engine design suffered problems, principally due to overcooled liners, resulting in scuffing....

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