Both crosshead type and trunk type lubricating oil are received onboard a vessel. These two oils cannot be interchanged due to which of the following reasons?
• Crosshead diesel engines vs trunk piston engines and how their lubrication systems differ • The role of base number (BN) in cylinder and crankcase oils • Why certain engine oils are formulated specifically for high sulfur fuel combustion products
• Think about which engine type’s lubricating oil needs strong detergent and neutralizing properties for acidic combustion products • Ask yourself: in a crosshead engine, which parts are lubricated by cylinder oil versus system (crankcase) oil, and how that compares to a trunk piston engine • Consider whether physical properties like flash point or pour point are usually the main reason different engine oils cannot be interchanged
• Verify which oil (crosshead cylinder oil or trunk piston oil) typically has the higher base number (BN) and why • Check whether the main reason for non‑interchangeability is chemical/additive formulation rather than just physical properties like flash point or pour point • Confirm how piston ring and liner design relates to the specific type and function of the lubricating oil used
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