This course manual focuses on lubrication services for Light Duty Vehicles (LDVs) and Heavy Duty Vehicles (HDVs). It covers the fundamentals of oils and greases, their purposes, types, and viscosity ratings. The manual guides performing basic lube services, including oil changes, lubrication of engine components, and checking fluid levels. It outlines the procedures for changing oils in different vehicle components, such as manual and automatic transmissions, differentials, and cooling systems. The course emphasizes safety practices, the importance of selecting the correct lubricants, and maintaining proper fluid levels to ensure vehicle longevity and performance. A quiz at the end reinforces understanding of key concepts and procedures.