The API rating certifies that engine oil meets what?

The API (American Petroleum Institute) rating certifies that engine oil meets specific quality and performance standards. This rating helps consumers identify whether the oil has passed rigorous testing for its ability to protect engines under various operating conditions, ensuring it meets or exceeds the minimum requirements set for engine oils.

The API rating evaluates factors such as how well the oil provides lubrication and protection from wear, sludge, and corrosion. Moreover, it signifies that the oil can perform effectively within the manufacturer's specifications, contributing to the overall efficiency and longevity of the engine.

While options mentioning cost effectiveness, environmental standards, and viscosity requirements are important considerations for consumers when choosing motor oils, they do not directly reflect what the API rating certifies. The primary focus of the API certification is centered on the technical performance and quality attributes of the oil itself.