A friend sent these links to me:
https://www.fcsdchemicalsandlubricants.com/main/additionalinfo/Ford%20Motor%20Company%20CK-4%20FA-4%20Position%20Statement.pdf
http://www.truckinginfo.com/channel/fuel-smarts/news/story/2017/03/ford-offers-ck-4-alternative-oil-for-super-duty-diesels.aspx...