Caltex Delo 400 SLK SAE 15W-40 CK-4 Premium Diesel Engine Oil – High-Performance Lubrication Solution for Modern Diesel Engines
In the context of increasingly stringent emission regulations and more demanding operating requirements for diesel engines, selecting the right engine oil not only affects equipment durability but also directly impacts fuel economy, maintenance costs, and overall fleet reliability.
Caltex Delo 400 SLK SAE 15W-40 CK-4 is a premium diesel engine oil developed to comprehensively meet these requirements.
This is a genuine Chevron/Caltex product and is officially distributed in Vietnam by Viet Duc Joint Stock Company as a strategic distributor, serving transportation fleets, construction equipment, mining operations, infrastructure projects, and heavy industries nationwide.
ISOSYN Technology and Low SAPS Formulation – Superior Protection for Modern Engines
Caltex Delo 400 SLK SAE 15W-40 CK-4 is manufactured using Chevron’s advanced ISOSYN technology combined with next-generation additive systems, delivering outstanding protection under the most severe operating conditions.
The product belongs to the “Low SAPS” engine oil category, meaning it contains low levels of sulfated ash, phosphorus, and sulfur.
This is a critical factor that makes the oil suitable for modern diesel engines equipped with advanced exhaust after-treatment systems such as:
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Diesel Particulate Filters (DPF)
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Selective Catalytic Reduction systems (SCR)
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Exhaust Gas Recirculation systems (EGR)
As a result, the oil not only protects the engine itself but also helps maintain the efficiency of emission-control components, reducing blockage risks and extending their service life.
Outstanding Benefits for Customers and Fleet Operations
One of the greatest advantages of Caltex Delo 400 SLK SAE 15W-40 CK-4 is its ability to reduce total operating costs.
Its superior soot dispersion capability keeps soot particles and combustion by-products suspended within the oil, minimizing deposit formation on:
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Pistons
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Piston rings
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Cylinder liners
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Oil filters
This helps maintain engine cleanliness over extended periods, reduces polishing wear, minimizes oil thickening during service, and extends oil drain intervals.
The highly effective anti-wear and anti-corrosion additive system provides excellent protection for critical engine components such as:
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Crankshafts
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Camshafts
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Bearings
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Cylinder liners
even under heavy-load and high-temperature operating conditions.
This contributes to:
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Increased equipment durability
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Improved operational reliability
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Reduced unplanned downtime
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Higher fleet utilization efficiency
In addition, thanks to its balanced formulation and backward compatibility with previous API categories, Caltex Delo 400 SLK can be used across multiple engine generations within mixed fleets, from modern engines to older models.
This helps businesses:
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Reduce lubricant inventory variety
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Simplify warehouse management
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Minimize the risk of product misapplication
Maintaining Exhaust Emission System Performance
With increasingly strict emission standards such as Euro IV, V, VI and US EPA 2007, 2010, and GHG 2017 regulations, protection requirements now extend beyond the engine itself to the entire emission control system.
Caltex Delo 400 SLK SAE 15W-40 CK-4 is specifically designed to maximize the service life of sensitive components such as diesel particulate filters (DPF) and catalytic converters.
By reducing the levels of metallic additives, phosphorus, and sulfur, the oil minimizes non-combustible ash formation, thereby:
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Extending filter cleaning intervals
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Reducing replacement frequency
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Lowering maintenance costs
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Helping engines maintain emission compliance
Key Technical Features
Caltex Delo 400 SLK SAE 15W-40 CK-4 meets and exceeds major industry performance standards including:
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API CK-4
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API CJ-4
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API CI-4 PLUS/SM
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ACEA E9
These standards apply to high-speed diesel engines operating under:
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Severe duty cycles
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Dusty environments
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Heavy loads
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Harsh climate conditions
The product is formulated to maintain viscosity stability across a wide temperature range, ensuring:
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Excellent cold-start lubrication
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Stable oil film protection at high operating temperatures
This helps reduce friction and improve overall engine efficiency.
Practical Applications
Caltex Delo 400 SLK SAE 15W-40 CK-4 is recommended for heavy-duty diesel engines used in:
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Commercial road transportation such as trucks, tractor heads, container trucks, and dump trucks
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Construction and industrial equipment including excavators, bulldozers, graders, cranes, and industrial generators
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Engines complying with the latest emission standards including US EPA 2002, 2007, 2010, GHG 2017, Euro IV, V, VI, and Australian ADR 80/02 and ADR 80/03 standards for heavy-duty vehicles
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Mixed fleets consisting of both older and newer equipment from European, North American, and Japanese OEM manufacturers
The product is specifically designed to operate reliably under the harshest conditions involving:
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High temperatures
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Heavy loads
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Extended operating hours
Viet Duc Joint Stock Company – Strategic Caltex Distributor in Vietnam
As a strategic distributor of Chevron / Caltex products in Vietnam, Viet Duc Joint Stock Company not only supplies genuine products but also provides technical consulting and lubrication optimization solutions tailored to each vehicle type and actual operating condition.
The company is committed to supplying genuine Caltex products with clear origin and comprehensive technical support regarding:
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Lubricant selection
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Oil drain intervals
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Fleet lubrication management
helping customers optimize investment efficiency and reduce long-term operating costs.
Conclusion
Caltex Delo 400 SLK SAE 15W-40 CK-4 is more than just a conventional diesel engine oil — it is a comprehensive lubrication solution for modern diesel engines and fleets operating under severe conditions.
With advanced ISOSYN technology, a Low SAPS formulation, and versatile application capability, the product delivers outstanding benefits in:
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Engine protection
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Equipment life extension
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Operating cost optimization
To ensure the use of genuine products and receive professional technical consultation, customers can directly contact Viet Duc Joint Stock Company — the strategic distributor of Chevron/Caltex in Vietnam — for the most suitable lubrication solutions for their fleets and operating systems.
