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Less viscous than HFO, doesn't require heating. Used in smaller engines and auxiliary engines.

A distillate fuel that is cleaner than HFO or MDO. Used in areas with strict emissions control.

Offers almost unlimited range. Strict regulations due to safety concerns and radioactive waste.

Most common type used in commercial shipping due to its cost-effectiveness. High in sulfur, requires heating before use.

Only emits water vapor, requires significant investment in infrastructure and technology.

Term for any fuel used aboard ships, typically refers to the heavy, residual oil used before more stringent regulations.

Renewable source made from biological materials. Reduction in overall lifecycle CO2 emissions.

Biodegradable and produces fewer pollutants. Suitable for short sea shipping and ferries.

Blend of heavy fuel oil and marine gas oil, characteristics depend on the blend.