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Marine oil has two primary meanings: fish oil and lubricating oil for marine engines.1

Fish oil is a fatty oil extracted from the bodies of fish, commonly from anchovy, menhaden, herring, and pilchard. It is used in the production of various products, including margarine, cooking oil, cosmetics, paints, soaps, and candles. Fish oil is also utilized in leather tanning, rubber manufacturing, and the creation of synthetic waxes. Fish-liver oils, such as cod-liver oil, were historically significant sources of vitamins A and D, though these are now synthesized more affordably.2

Marine engine oil is a lubricant specifically designed for marine engines.1

The term "marine oil" can also be associated with environmental concerns, such as the impact of oil spills on marine life, as seen in the Deepwater Horizon incident where thousands of birds, mammals, and sea turtles were affected by leaked oil.3

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