CJ-4 oils are designed to handle the higher combustion temperatures and sulfur content levels found in today's ultra-low sulfur diesel fuel. Recommended Oil Specifications and Options When shopping for oil, look for the API CJ-4 certification on the label, but you will also encounter two viscosity grades that dominate the recommendation charts: 5W-40 and 15W-40.
Understanding CJ-4 Oil Specifications for Your 6.7 Powerstroke
This specification, developed by the American Petroleum Institute, supersedes previous generations and ensures the oil meets the rigorous demands of modern diesel technology. For those seeking maximum protection, premium synthetics from brands like Royal Purple or AMSOIL use advanced ester-based chemistry that provides exceptional lubricity and thermal stability.
Leading brands like Motorcraft, the OEM supplier for Ford, formulate their CJ-4 oil specifically to match the unique tolerances of the Powerstroke. 7L Powerstroke is the single most important maintenance decision you can make to protect your investment.
Choosing the Right CJ-4 Oil for Your Ford 6.7 Powerstroke
Both viscosities meet the CJ-4 standard, but they perform differently. The choice between them often depends on your climate and driving habits.
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