We recommend using only environmentally friendly high-grade chain lubricant for automatic long-lasting lubrication of the saw chain and guide bar. Products not specifically designed for chain lubrication can shorten the life of the chain and guide bar. Note: Never use waste oil. Repeated skin contact with waste oil over a length of time can be harmful to health. Waste oil is also harmful to the environment. Furthermore, waste oil lacks the necessary lubricating properties and should not be used as a chain lubricant.