The viscosity grade of oil is rated by which organization?

• A. American Petroleum Institute (API)
• B. Environmental Protection Agency (EPA)
• C. Occupational Safety and Health Administration (OSHA)
• D. Food and Drug Administration (FDA)

Answer: (B)

The viscosity grade of oil is rated by the American Petroleum Institute (API), which is recognized for its standards in the petroleum and oil industry, including the classification of oil based on its viscosity. The API has established a numbering system that helps consumers and professionals understand the performance and suitability of various oils for specific applications, primarily in engines and machinery.

The Environmental Protection Agency (EPA) is focused on environmental regulations and protection, overseeing issues such as pollution and chemical safety, but it does not rate oil viscosity. Similarly, the Occupational Safety and Health Administration (OSHA) is concerned with workplace safety and health regulations, while the Food and Drug Administration (FDA) regulates food safety and pharmaceuticals. None of these organizations have the specific function of rating the viscosity of oils, which is solely the domain of the American Petroleum Institute.