Diesel Engine Oil Grades Explained: CH-4, CI-4, CK-4 and Viscosity Selection Guide
Diesel engines operate under high loads, high temperatures and long working conditions. Choosing the correct diesel engine oil is essential for engine protection, durability and performance.
BAKLUCK is a professional diesel engine oil manufacturer in China, supplying high-performance diesel lubricants including API CK-4, CI-4 and CH-4 diesel engine oils for trucks, commercial vehicles, construction machinery and industrial equipment.
What Is Diesel Engine Oil?
Diesel engine oil is specially formulated to protect heavy-duty diesel engines from:
- Engine wear
- Soot accumulation
- Oxidation
- High-temperature deposits
- Corrosion
Compared with gasoline engine oil, diesel lubricants require stronger cleaning ability and better protection under heavy-duty operating conditions.
BAKLUCK High-Performance Diesel Engine Oil Range
1. API CK-4 SAE 15W-40 Diesel Engine Oil
Product:
BAKLUCK High-Performance Diesel Engine Oil
Specification:
- API CK-4
- SAE 15W-40
Package Options:
- 4L bottle
- 16L container
- 18L pail
Key Benefits:
- Strong oil film strength helps protect engines under high load and temperature
- Advanced low-ash chemistry supports emission-control systems
- Excellent wear protection and oxidation resistance
- Helps maintain engine cleanliness
Applications:
Suitable for:
- Heavy-duty diesel engines
- Commercial trucks
- Construction equipment
- Modern diesel vehicles requiring API CK-4 performance
2. API CI-4 SAE 20W-50 Diesel Engine Oil
Product:
BAKLUCK High-Performance Diesel Engine Oil
Specification:
- API CI-4
- SAE 20W-50
Key Benefits:
- Strong protection under high temperature operation
- Excellent detergent and dispersant performance
- Helps reduce sludge and piston deposits
- Provides reliable lubrication under severe conditions
Applications:
Recommended for:
- Heavy-duty diesel vehicles
- Older diesel engines
- Trucks operating in hot climates
- Commercial transportation applications
3. API CI-4 SAE 15W-40 Diesel Engine Oil
Specification:
- API CI-4
- SAE 15W-40
Key Benefits:
- Good soot control capability
- Helps maintain engine cleanliness
- Stable viscosity performance during extended service
- Protects engine components under heavy load
Applications:
Suitable for:
- Diesel trucks
- Commercial vehicles
- Construction machinery
- Fleet vehicles
4. API CH-4 SAE 15W-40 Diesel Engine Oil
Specification:
- API CH-4
- SAE 15W-40
Key Benefits:
- Reliable wear protection
- Good cleaning performance
- Helps control deposits
- Suitable for demanding diesel engine operations
Applications:
Used in:
- Diesel engines requiring API CH-4 performance
- Trucks
- Agricultural machinery
- Industrial diesel equipment
How to Choose Diesel Engine Oil?
The correct diesel engine oil depends on:
1. API Performance Level
| API Grade | Application |
|---|---|
| CH-4 | Traditional heavy-duty diesel engines |
| CI-4 | Advanced diesel engines with improved soot control |
| CK-4 | Modern high-performance diesel engines |
2. SAE Viscosity Grade
SAE 15W-40
Advantages:
- Wide temperature performance
- Commonly used worldwide
- Suitable for trucks and commercial vehicles
SAE 20W-50
Advantages:
- Higher viscosity at operating temperature
- Suitable for older engines and hot climates
OEM Diesel Engine Oil Manufacturing Service
BAKLUCK provides professional OEM and private label diesel engine oil solutions for global distributors.
Our OEM services include:
- Custom lubricant formulation
- Private label packaging
- Label design support
- Flexible production solutions
We support international customers with:
- Different API specifications
- Various viscosity grades
- Customized packaging options
Why Choose BAKLUCK Diesel Engine Oil?
✅ Professional lubricant manufacturer in China
✅ Automotive and industrial lubricant production experience
✅ OEM private label service
✅ Flexible packaging solutions
✅ Global export support
Contact BAKLUCK
Looking for a reliable diesel engine oil supplier in China?
Contact BAKLUCK for API CH-4, CI-4, CK-4 diesel engine oil supply and OEM cooperation.