Segmentation by type classifies marine lubricants into engine oils, gear oils, hydraulic fluids, coolant fluids, and greases, each fulfilling distinct functional criteria. Engine oils dominate due to the extensive lubrication requirements of diesel and gas turbines, where viscosity stability and soot control directly affect fuel consumption and emissions. Gear oils, formulated for high‑pressure gear sets, capture a notable share because of their role in transmission efficiency and gear wear mitigation. Hydraulic fluids, essential for steering and cargo‑handling hydraulics, are differentiated by fire‑resistance and anti‑wear additives, influencing their market uptake in safety‑critical vessels. Coolant fluids, blending corrosion inhibition with thermal management, support engine longevity and are increasingly adopted in newer vessel designs. Greases, used for bearings, seals, and external moving parts, provide a niche but indispensable contribution, especially in low‑speed, high‑load applications where liquid lubricants are impractical. The relative weight of each type mirrors the technical specifications of marine equipment and the cost‑benefit analysis performed by ship owners and operators.