From CI-4 to CK-4: What Changes in Low-SAPS Heavy-Duty Diesel Engine Oil Packages and Why It Matters for Your Fleet
Classification: Industry News
Sep 12,2026
From CI-4 to CK-4: What Changes in Low-SAPS Heavy-Duty Diesel Engine Oil Packages and Why It Matters for Your Fleet
Twenty years of emissions rules turned diesel packages into precision chemistry
Each diesel oil category since CH-4 was written to protect the aftertreatment of its day. CI-4 answered EGR, CJ-4 answered the diesel particulate filter, and CK-4 answered faster injection and hotter, more fuel-efficient engines. Understanding what each step changed tells a blender or fleet operator exactly which package a given truck deserves.
Why the limits kept tightening
Sulfated ash, sulfur and phosphorus that older engines shrugged off became poison to DPFs and SCR catalysts: ash plugs the filter, sulfur and phosphorus poison the catalyst. Every category step therefore lowered the chemical budget the oil is allowed to spend.
What CK-4 demands from the package
CK-4 holds sulfated ash to 1.0% and tightens phosphorus limits, while adding the most severe duty-cycle testing yet - including oxidation and aeration resistance at high temperature and exceptional shear and soot stability for extended drains that can exceed 100,000 km in well-run fleets.
The result is a package where borated dispersants, carefully balanced detergents and robust antioxidants must deliver more protection from a smaller chemical allowance than any predecessor category.
Four categories, one logic: protect the hardware of the day
Specification | CH-4 | CI-4 | CJ-4 | CK-4 |
Written for | 1998-era engines | 2002 EGR engines | 2007 DPF engines | 2017 fast-injection engines |
Sulfated ash ceiling | Higher | Higher | 1.0% typical | 1.0%, tighter control |
Soot / aeration handling | Good | Better | Advanced | Most severe duty cycle |
Aftertreatment compatibility | Limited | Partial | Yes | Yes, improved durability |
J&D reference package | JD3160 | JD3180 | JD3190 | JD3192 |
Figure 1. CK-4-grade samples verified beside a DPF core before a fleet-wide changeover.
Matching the package to your fleet
Legacy fleets without aftertreatment can stay economically on CH-4 or CI-4 chemistry. Mixed and EGR-era fleets fit CI-4/CH-4 grades. Any DPF-equipped truck needs CJ-4 as a minimum and is best served by CK-4. FA-4 sits alongside CK-4 as a thinner, fuel-economy-focused option - it is not interchangeable with CK-4 in older engines.
Work with a lubricant additives partner Need grades, samples or a formulation review? J&D supplies detergent and dispersant components, API-oriented engine, gear and hydraulic packages, PAO base stocks and Hi-Ester synthetic esters from one source, with technical support for trials and qualification. www.jdlubricant.com |
Related Blog
Sep 07,2026
Sep 10,2026
Sep 03,2026
Block C, Rongyu City Square, 200 meters north of the intersection of Zhongyuan Road and Pushang Road, Puyang City, Henan Province, China
