Shell Rotella CK-4 and FA-4




  1. What is changing? The Environmental Protection Agency (EPA), the National Highway Traffic Safety Administration (NHTSA) and major engine manufacturers have agreed on ambitious new goals for fuel economy and emissions in future medium – and heavy-duty vehicles. To meet these goals without any compromise in engine protection, a new generation of diesel engine oils is required.
  2. What is CK-4? CK-4 engine oils will be a direct replacement for the engine oils you’re using now. You’ll be able to buy the same viscosity grades and oil types (conventional, full synthetic, synthetic blend) you’re using now, and they’ll be “backwards compatible” to ALL current vehicles. They’ll just also confirm to the new API CK-4 standards.
  3. What is FA-4? The new FA-4 engine oils will be offered in lower viscosity grades and are designed primarily for next-generation engines to help maximize fuel economy without sacrificing engine protection. These FA-4 oils may have limited backwards compatibility2 and would be labeled as such. Oil companies and OEMs are currently testing these products in a range of applications to demonstrate their performance without sacrificing engine protection.
  4. When do these changes take place? The American Petroleum Institute (API) will begin issuing licenses for these new categories on Dec 1, 2016. Expect to start seeing the CK-4 and FA-4 designations in the API donut on product labels on or after Dec 1, 2016.
  5. What benefits can customers expect from CK-4 and FA-4?
    1. Fuel Economy – Fuel Economy continues to be a high priority for HDEO oils, and the competing requirements for both fuel economy and CO2 reduction are two of the main drivers for the category.The CK-4 category (formerly called PC-11A), which is backward-compatible with the CJ-4 category, emphasizes High Temperature High Shear (HTHS) protection, and as much fuel economy performance as can be provided with a formulation that has a HTHS above 3-5cP.In contrast, the FA-4 category (formerly called PC-11B) emphasizes fuel economy levels above and beyond CJ-4 and CK-4 oils through the use of thinner viscosity fluids, with an emphasis on “Low Temperature High Shear” between 2.9cP and 3.2cP.
    2. Shear Stability – Shear stability is the ability of the oil molecules to resist shearing under severe stress inside the engine. Oil shearing results in a lower viscosity, and excessive viscosity loss could impact the ability of the oil to protect vital engine parts. The new CK-4 standards call for improvements in shear stability versus CJ-4 oils. New, more stringent shear stability test limits are being developed to validate that each CK-4 oil’s shear stability meets the new guidelines.

To read more…download this PDF.

Leave a comment

Your tour guides did an excellent job of explaining all the processes involved in detail. They also answered all the numerous questions we had.

Each and every day, I am so glad I chose Allied for tires and oil.  The Des Moines (Iowa) crew is fantastic and I feel like I am in the “safe zone” every time I pull in there.  And choosing the oil was just one more good move I made.

I am very satisfied with what ESCO did for the district. They worked well together as well as being very clean. They understood the busy area. I would have them work on anything in the district. Great job guys!