Lubricants or oils are fluids used to reduce friction between the moving parts of engines and other mechanical parts of vehicles, such as gearboxes and transfer cases. In addition to reducing wear and extending the life of parts, lubricants also help to dissipate heat generated by friction, keeping components cool and running efficiently. It is important to choose the right lubricant for your vehicle type and model, following the manufacturer's specifications to ensure the best performance and protection of components.