Frequently Asked Questions
What is API?
API, the American Petroleum Institute develops standards for passenger car oils, and one of the two main considerations for street car oils are emissions regulations and equipment. All current production cars feature catalytic converters for cleaner emissions. Unfortunately, the best anti-wear additive, Zinc, harms catalytic converts. As a result, the API has been reducing the amount of Zinc it allows for the last 10 years. Learn More >