China Longhai CH-4 Diesel Engine Oil Suppliers - Premium Heavy-Duty Protection & Engine Cleanliness from Factory
Key Features & Benefits
✅ Ultimate Wear Protection Under Heavy Loads
- Fortified with extreme-pressure anti-wear additives to minimize friction and protect critical engine components (pistons, bearings, camshafts) during low-speed, high-torque operation
- Ideal for long-haul transportation, construction, and mining equipment that operates under continuous stress
- Specialized additive package maintains protective oil film even under severe pressure conditions
✅ Exceptional Cleanliness & Soot Control
- Advanced detergent and dispersant additives prevent sludge, varnish, and piston deposits even in high-soot environments
- Maintains engine cleanliness for smooth operation and extended engine life
- Superior soot dispersion prevents oil thickening and maintains proper oil flow to critical components
✅ High-Temperature Stability & Oxidation Resistance
- Hydrotreated base oils provide outstanding thermal stability, reducing oil breakdown during prolonged high-speed operation
- Resists viscosity thickening to ensure continuous lubrication under extreme heat conditions
- Advanced antioxidant additives protect against thermal degradation and deposit formation
✅ API CH-4 Certified for Modern Diesel Engines
- Meets API CH-4 specifications for enhanced protection of turbocharged and EGR-equipped engines
- Compatible with low-sulfur diesel fuels to help reduce emissions and protect aftertreatment systems (DPF, SCR)
- Suitable for both older and modern engine designs requiring robust performance
✅ Improved Fuel Efficiency & Extended Drain Intervals
- Optimized viscosity and friction modifiers contribute to better fuel economy
- Strong TBN (Total Base Number) retention neutralizes acidic byproducts, extending oil change intervals
- Reduces maintenance costs while maintaining engine protection
Technical Specifications
| API Classification | CH-4 |
| Viscosity Grades Available | 15W-40, 10W-30, 20W-50 |
| Base Oil Type | Group III Hydrocracked |
| Key Additives | Extreme Pressure Anti-Wear, Detergents, Dispersants, Antioxidants |
Recommended Applications
Why Choose Longhai API CH-4?
Laboratory tested and field proven in extreme operating conditions.
Extended drain capability reduces maintenance costs.
Keeps engines cleaner for longer service life.
Helps meet emission standards while protecting aftertreatment systems.
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Frequently Asked Questions
What does API CH-4 certification mean for diesel engines?
API CH-4 is a standard introduced for high-speed, four-stroke diesel engines designed to meet 1998 exhaust emission standards. It provides outstanding protection against soot-induced wear, high-temperature deposits, and corrosion.
Can Longhai API CH-4 oil be used in older diesel engines?
Yes, Longhai API CH-4 diesel engine oil is backward compatible. It can safely be used in older engines requiring API CG-4, CF-4, or CD performance levels.
Which viscosity grade of API CH-4 should I choose?
Viscosity choice depends on your operating environment and machinery specifications. 15W-40 is the standard for heavy-duty fleets, 10W-30 is ideal for colder climates, and 20W-50 offers enhanced protection under extreme high-temperature operations.
How does this oil help extend oil drain intervals?
Longhai API CH-4 is formulated with high-quality Group III base oils and a strong Total Base Number (TBN) retention package. This neutralizes harmful combustion acids and prevents premature oxidation, allowing the oil to protect your engine longer between service intervals.
Is this oil compatible with EGR systems?
Yes, it is specifically engineered to handle the increased soot levels and higher thermal loads associated with engines equipped with Exhaust Gas Recirculation (EGR) systems.
Does this oil protect turbochargers?
Absolutely. The advanced thermal stability and anti-wear additives prevent deposit formation in the high-temperature bearing areas of turbochargers, ensuring continuous lubrication and cooling.