15W40 CK-4 Oil Equivalent — Brand Comparison & Cross Reference
API CK-4 15W-40 is a heavy-duty diesel engine oil specification designed for high-speed, four-stroke diesel engines. It provides superior protection against oxidation, viscosity loss, and oil aeration compared to the previous CI-4 standard. Suitable for on-highway and off-highway applications including trucks, buses, and construction equipment.
Brand Comparison Table
The following table shows the 15W40 CK-4 equivalent product from each major lubricant brand. Use this to find a direct substitute when switching suppliers or sourcing alternatives.
| Brand | Product Name |
|---|---|
 Sinopec | T700 15W40 |
 Castrol | Vecton |
 Mobil | Delvac Modern |
 Shell | Rimula R4 L |
 Valvoline | All Fleet Plus E900 |
 Caltex | Delo 400 SLK |
 Fuchs | Titan Cargo |
 Penrite | Convoy Ultra HD |
 Gulf Western | Top Dog Indestructible |
Common Applications
- Long-haul diesel trucks and fleet vehicles
- Construction equipment (excavators, loaders, dozers)
- Agricultural tractors and combine harvesters
- On-highway buses and transit vehicles
- Stationary diesel generators and pumps
Frequently Asked Questions
What is the difference between CK-4 and CI-4 engine oil?
CK-4 is the successor to CI-4 and provides improved oxidation resistance, shear stability, and aeration control. CK-4 oils are backward compatible with CI-4 and older API categories, so they can replace CI-4 oils in existing engines.
Can I use 15W-40 CK-4 oil in older diesel engines?
Yes. API CK-4 is backward compatible with CI-4, CI-4 Plus, CH-4, CG-4, and older categories. It is safe to use in older diesel engines that originally called for those specifications.
How often should I change 15W-40 CK-4 engine oil?
Oil change intervals depend on the engine manufacturer, duty cycle, and operating conditions. Typical intervals range from 15,000 to 40,000 km for on-highway trucks, while severe-duty applications may require more frequent changes. Always follow the OEM recommendation.
Is CK-4 15W-40 suitable for both petrol and diesel engines?
CK-4 is specifically designed for diesel engines. While it may carry a dual API rating (e.g., CK-4/SN), it is formulated primarily for diesel service. Petrol engines should use an oil meeting the appropriate API S-category.
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