API CK-4 Heavy-Duty Diesel Engine Oil Additive Package
API CK-4 heavy-duty diesel engine oil additive packages are complete additive concentrates formulated for heavy-duty diesel engines equipped with advanced exhaust aftertreatment systems (EGR, DPF, SCR). These packages deliver improved oxidation resistance, shear stability, aeration control, and soot-handling dispersancy versus prior CJ-4 chemistry. They are designed for use with Group II and III base oils at 10–16% treat rate and must pass a demanding sequence of industry engine dyno and bench tests.
Technical Specifications
| appearance | Dark brown to black liquid |
| SAPS content | Controlled SAPS for DPF compatibility |
| TBN of package | 80–200 mg KOH/g |
| flash point (COC) | >170 °C |
| treat rate in finished oil | 10–16 wt% |
| kinematic viscosity of package (100°C) | 80–300 mm²/s |
Applications
- On-highway heavy-duty diesel truck engine oils (SAE 15W-40, 10W-30, 10W-40)
- Construction and mining equipment diesel engine oils
- Agricultural tractor diesel engine oils
- Stationary diesel generator and compressor lubricants
- Marine diesel engine oils for medium-speed diesel applications
Key Features
- Meets API CK-4 and backward-compatible CI-4 Plus, CH-4 specifications for fleet flexibility
- Enhanced oxidation resistance for extended drain intervals in high-EGR modern diesel engines
- Controlled SAPS formulation protects diesel particulate filters and SCR aftertreatment systems
- Superior soot dispersancy maintains engine cleanliness under high soot loading in EGR engines
Grade Variants & Supplier Reference
Specific grades available from leading Chinese-market suppliers. Spec sheets and lead-time vary per grade — request a quote to confirm availability.
| Appearance | Brown viscous liquid |
| P Content, m% | 0.73 |
| Ca Content, m% | 1.55 |
| Zn Content, m% | 0.83 |
| Density (20℃), kg/m3 | 955 |
| Flash Point (COC), ℃ | 216 |
| Total Base Number, mgKOH/g | 60 |
| Kinematic Viscosity (100℃), mm2/s | 175 |
API CK-4/CJ-4 multi-grade package; treat rate ~12.5-14.0% in 15W-40.
View on supplier site →| Appearance | Brown viscous liquid |
| P Content, m% | 1.16 |
| Ca Content, m% | 2.55 |
| Mo Content, m% | 0.052 |
| Zn Content, m% | 1.31 |
| Density (20℃), kg/m3 | 972 |
| Flash Point (COC), ℃ | 220 |
| Total Base Number, mgKOH/g | 83 |
| Kinematic Viscosity (100℃), mm2/s | 146 |
API CI-4 (older tier, still used in Latin America / Africa / Tier-3 export markets); treat rate ~11.0-13.0%.
View on supplier site →Big 4 Equivalents Cross-Reference
Approximate functional equivalents from leading global additive houses (Lubrizol, Infineum, Afton Chemical, Chevron Oronite). Chemistry tier, treat rate, and additive synergy may differ — always verify against the supplier TDS before formulation lock-in.
- OS-76105 (CK-4)
- OS-67051 (CI-4)
- D-3603 (CK-4)
- D-3415 (CI-4)
- HiTEC 11091 (CK-4)
- HiTEC 11000 (CI-4 family)
- OLOA 56035 (CK-4)
- OLOA 55300 (CI-4)