Keller-Heartt Blog: July 2017
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What Do New CK-4 and FA-4 Oils Mean for Your Fleet?

The climate is getting hotter and so are modern engines. While federal regulations for emissions are currently being discussed within the new administration, two new categories of engine oil were recently made available for gas and diesel engines to improve fuel economy, keep up with changing engine technology, and adhere to EPA guidelines. The new CK-4 and FA-4 oils come as a replacement to old CJ-4 oils with greater, cost-saving benefits.

How will consumers save money?

CK-4 and FA-4 oils promise greater fuel economy and a longer oil lifespan. Consumers will get longer drain intervals due to a more stable oil with strong, protective additives. There are several components that make CK-4 and FA-4 oils more efficient:

  1. CK-4 oils run hotter. Today’s engines run at higher temperatures, meaning vehicles need to have a higher HTHS (Higher Temperature High Shear) viscosity oil. CK-4 oils have improved shear stability to handle high stress conditions and maintain viscosity so that your oil, and your engine, won’t fail.
  2. FA-4 oil has a lower HTHS viscosity, so it is easier to pump, especially during cold starts. Lower viscosity oils therefore increase fuel economy, and FA-4 oil is tested to improve fuel economy beyond CK-4 oils in diesel engines.
  3. One of the greatest benefits of both oils are their strong resistance to oxidation. Oxidation increases oil viscosity by creating sludge, leading to premature oil changes and maintenance costs. These new oils, however, promote stability and cleanliness under heavy-duty conditions.
  4. CK-4 and FA-4 oils have better aeration control than previous CJ-4 oils. High-speed engine operations cause air bubbles to become trapped in engine oil, but the new oil varieties are better able to release air bubbles so your oil won’t be compromised.

Who benefits?

CK-4 oils have full backwards compatibility with older engine models, and these oils are available in all current grades. Though Ford and Motorcraft do not recommend CK-4 oils for their F-series diesel trucks, CK-4 oils will benefit most engines. FA-4 oil, however, has limited backwards compatibility. These oils are designed for the newest engine models. It is best to check with the engine manufacturer to determine if CK-4 or FA-4 oils are right for you.


When you need the highest quality CK-4 and FA-4 oils at the best price for your fleet, Keller-Heartt has you covered! Shop our large inventory of heavy duty motor oils here.