PC-11 Explained Site
“Introduction of PC-11 diesel engine oils means more options when it comes to selecting the right product to maximize fuel economy while maintaining the protection you expect to keep your equipment running efficiently. Additionally, newer on-road diesel equipment will start to come factory filled with PC-11B (API FA-4) oils in the future and will require Diesel Engine Oil selection guidance for some operators.”
Check out the new information about PC-11. Chevron has put together an easy to read site explaining what is to come of the new categories: API CK-4 and API FA-4.