Heavy-Duty Diesel Engine Oil (API CK-4 15W-40 / CI-4 20W-50)
Formulated from hydrocracked Group II+ base stocks with advanced low-SAPS detergent and dispersant additive chemistry, delivering extended drain intervals, soot dispersion, piston deposit control, and wear protection for Euro V/VI and Tier 4 engines equipped with DPF, SCR, and EGR.
Tribological Standard Definition & Engineering Direct Answer
FOSS Heavy-Duty Diesel Engine Oil is an advanced commercial fleet lubricant formulated from severely hydrotreated Group II+ base stocks and an optimized low-SAPS / mid-SAPS additive package. Fully compliant with API CK-4, CJ-4, CI-4 PLUS, ACEA E9/E11, Cummins CES 20086, Caterpillar ECF-3, Detroit Diesel DDC 93K222, and Volvo VDS-4.5 standards, it is engineered for turbocharged high-output diesel engines operating under severe haulage and mining conditions. The fluid exhibits superior soot dispersion capacity (ASTM D7899 soot index), maintaining kinematic viscosity stability under heavy soot loading up to 4.5% without oil thickening. With a Total Base Number (TBN) of 10.0 mg KOH/g (ASTM D2896), it delivers strong acid-neutralizing capability while restricting sulfated ash below 1.0 wt% (ASTM D874), protecting Diesel Particulate Filters (DPF) from premature plugging and preventing catalyst poisoning in Selective Catalytic Reduction (SCR) systems. High-temperature high-shear (HTHS) viscosity exceeds 3.7 mPa.s at 150°C (ASTM D4683), ensuring hydrodynamic bearing film protection under peak cylinder pressures. Supplied in UN 208L steel drums and 1,000L IBC totes.
Verified 208L Steel Drum Staging & Container Loading Bay
Photographic evidence from our Quanzhou plant floor and export container stuffing bay. Every batch is blended via automated mass-flow metering, sealed with waterproof tamper-evident bungs, and labeled with full batch test certificates.
Laboratory Physical & Chemical Parameters (Typical Test Values)
Every batch blended at our Quanzhou plant is certified against international testing standards before filling into UN 208L steel drums.
| Test Parameter | Test Method | 15W-40 (API CK-4) | 20W-50 (API CI-4) |
|---|---|---|---|
| Kinematic Viscosity @ 40°C (mm²/s) | ASTM D445 | 112.5 | 168.4 |
| Kinematic Viscosity @ 100°C (mm²/s) | ASTM D445 | 15.1 | 19.2 |
| Viscosity Index (VI) | ASTM D2270 | 140 | 130 |
| Total Base Number (TBN, mg KOH/g) | ASTM D2896 | 10.2 | 11.5 |
| Sulfated Ash Content (wt %) | ASTM D874 | 0.95% | 1.25% |
| Flash Point, COC (°C) | ASTM D92 | 232 | 238 |
| Pour Point (°C) | ASTM D97 | -36 | -27 |
| HTHS Viscosity @ 150°C (mPa.s) | ASTM D4683 | 4.1 | 4.6 |
| Noack Volatility Evaporation (% loss) | ASTM D5800 | 9.2% | 8.5% |
| CCS Cold Cranking Viscosity (mPa.s) | ASTM D5293 | 5,800 (-20°C) | 6,200 (-15°C) |
Commercial Vehicle & Heavy Equipment Application Scope
Engineered specifically for high-stress industrial machinery, minimizing friction coefficients and extending component service life.
Long-Haul Commercial Truck Fleets
Enables extended oil drain intervals up to 60,000 km in Euro V/VI highway tractors running modern low-emission powertrains.
Mining Dump Trucks & Large Excavators
15W-40 / 20W-50 grades protect high-displacement engines (Cat C15/C27, Cummins QSK) operating under extreme dust and high continuous loads.
Port Container Handlers & Reach Stackers
Resists rapid thermal oxidation and valve train scuffing during constant stop-and-go lifting cycles.
Stationary Diesel Generator Sets (Gensets)
Maintains high TBN reserve and clean piston ring lands in prime power units running on high-sulfur diesel.
Batch Quality Control & Standard Verification
Strict five-stage quality checkpoint from raw base oil tank unloading to finished drum sealing.
TBN Potentiometric Titration (ASTM D2896)
Every batch verified to ensure exact alkaline reserve for acid neutralization.
Noack Evaporative Loss Test (ASTM D5800)
Strictly limited below 10% to minimize engine oil consumption and turbocharger deposits.
ICP Multi-Element Additive Verification
Precise verification of zinc, calcium, magnesium, and phosphorus treat rates.
24-Month Sealed Retention Archive
Archived 1L production samples stored with complete CoA certificates for audit trail.
Export Packaging, Palletization & Container Loadability
Supplied in standard UN 1A1 cold-rolled steel 208L drums (80 drums per 20GP container = 16,640 liters) and 1,000L IBC totes.
Frequently Asked Technical & Procurement Questions
Clarifications on viscosity grades, synthetic formulations, oil drain intervals, and container freight.
Can API CK-4 engine oil be used in older engines requiring API CI-4 or CH-4?
How does CK-4 oil protect diesel particulate filters (DPF)?
What is the recommended drain interval for mining equipment?
Request Direct Factory Quotation & Technical Dossier
Receive competitive FOB Xiamen / CIF port container pricing, batch Certificate of Analysis (CoA), and sample dispatch confirmation.