What changed with CK-4 oil?

[hhow55]

(01-21-2017 )Nilao Wrote:  So what's the answer? Off brands that still sport the CJ designations? All the major brands have discontinued the CJ line claiming CK is 100% backwards compatible. Speedco is in the process of the changeover an will only offer CK oils.

The answer that i came up with, is in quickserve.cummins.com. Their is a list of oil's that are on the approved list from cummins, and yes i found one, actually several that is cj4 with the necessary additive's to provide long life for our motor's.