Certain connected parts (such as screw joints, lever mechanisms, pins, articulated joints in construction machinery and all types of laying with some clearance or overlap) may be difficult to disassemble after a certain time of usage, vibrations, high temperatures, loading and other aggressive factors of the environment.
The lubricants make the disassembly of joints easier, even after several years; it is reasonable to prevent complications by using suitable lubricants during the assembly.