Road transport operations subject engines, transmissions, axles, braking systems, and auxiliary equipment to sustained mechanical and thermal loads across long operating hours and variable duty cycles, requiring lubricants that maintain viscosity stability, oxidation control, and effective wear protection. Heavy goods vehicles and buses use a combination of engine oils, transmission fluids, axle and driveline oils, hydraulic fluids, and greases to manage heat, control wear, and support predictable service intervals under stop-start, motorway, and high-load operating conditions typical of UK road transport service.
