API CK-4 15W-40 is a heavy-duty diesel oil engineered for modern, high-performance engines (2017+). It offers superior oxidation resistance, shear stability, and DPF protection. Fully backward compatible with CJ-4 and CI-4 standards, it is ideal for mixed fleets, heavy loads, and warmer climates.
Key Uses and Applications
Modern Diesel Support: Optimized for 2026 and newer heavy-duty engines, including those with EGR/DPF systems and Euro IV, V, and VI compliance.
Heavy-Duty Operations: Ideal for long-haul trucking, construction, and mining equipment operating under severe service conditions.
Backward Compatibility: Suitable for mixed fleets requiring API CJ-4, CI-4 Plus, or CI-4, allowing for easier inventory management.
High-Load Protection: Provides excellent viscosity retention for high-load, low-speed tasks like towing and operation in hot climates.
PRODUCT PERFORMANCE
Advanced Protection: Outperforms CJ-4 with superior wear protection, soot control, and cleaner engine operation.
Maximum Stability: Resists oil thickening and heat breakdown (up to 83% better) while maintaining a consistent protective film.
Efficiency: Fully backward compatible with older engines and engineered for longer intervals between oil changes.
