The American Petroleum Institute (API) has formally adopted SAE 0W-8 and SAE 0W-12 viscosity grades into API Service Category SP, the most current gasoline engine oil category, the organization announced. API 1509 Engine Oil Licensing and Certification System (EOLCS) which is API’s standard defining how the API Engine Oil Service Categories and Quality Marks are… Continue reading API Adopts Low Viscosity Grade Engine Oil