The American Petroleum Institute (API) CK-4 and FA-4 performance categories are to be introduced as the next heavy-duty engine oil categories in December 2016. The new category developments began as a request from the Engine Manufacturers Association (EMA) in June 2011.
The CK-4 and FA-4 categories are being driven by changes in engine technology to meet upcoming North America emissions standards for CO2 and other greenhouse gas emissions reductions and fuel economy improvements. The EMA requested that a new category be split into two separate and distinct subcategories: one that preserves historical heavy-duty oil criteria and one that provides additional fuel efficiency benefits while maintaining durability. Advances in lubricant performance that are being addressed include oxidation stability, shear stability and aeration.
Nearly a decade has passed since the last API diesel engine oil category for North America was developed. During this time, engines have changed considerably and have improved fuel efficiency and increased power outputs. New emission legislation scheduled for diesel-powered commercial transport vehicles in 2017 requires reduced carbon dioxide emissions and improved fuel economy. This has created the need for a new performance level of lubricants. The specification defining these new lubricants was referred to as Proposed Category 11 (PC-11) during the development process and now, since the finalization of the specifications, they are designated as API CK-4 and FA-4. These oils will be first licensable in December 2016.
This presentation will cover the status of the specification development and performance requirement for this next generation of heavy-duty engine oils.