The case for a high-base-number lubricant continuing to provide the best all-round protection was presented by Paul Harrold, Castrol Marine’s technology manager for marine and energy lubricants, at Riviera’s Annual Marine Propulsion conference in March. “Where 40BN cylinder oils may suit vessels permanently operating in ECAs, the supplier has concluded that those of 70–80BN are better suited to vessels regularly slow steaming and on international trade, even those involve....

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