10W-40 Diesel Engine Oil

Formulated to meet API CI-4 performance requirements, this 10W-40 diesel oil is specifically suited for high-speed, four-stroke diesel engines where control of soot-induced viscosity increase and wear protection under sustained load are essential. Its formulation supports consistent lubrication and engine durability during extended operating hours in both on-highway and off-road service.

Key formulation characteristics include:

• Optimized viscosity behavior to ensure reliable oil flow during cold starts while maintaining sufficient film strength at normal and elevated operating temperatures.
• Enhanced oxidation stability to help control oil degradation, reduce sludge formation, and support consistent performance during extended operation.
• Effective detergent and dispersant performance to manage soot accumulation, support piston cleanliness, and limit internal deposits.
• Anti-wear protection designed to reduce mechanical wear on heavily loaded components such as camshafts, valve train assemblies, and bearings.
• Compatibility with EGR-equipped diesel engines, where effective soot dispersion and oxidation control are required to manage increased contaminant loading associated with exhaust gas recirculation systems.

The formulation of this multi-grade diesel is well suited for mixed fleet operations operating diesel engines without particulate filters, where a single oil must provide stable viscosity performance, soot control, and wear protection across varying duty cycles and engine designs.

10W-40 Diesel is recommended for use in heavy-duty trucks, buses, light commercial diesel vehicles, and off-road diesel equipment, including construction, agricultural, and industrial machinery operating under demanding service conditions.

Product Overview & Performance Profile

The SAE 10W-40 viscosity grade provides a balance between cold-start flow and high-temperature oil film strength, making it suitable for diesel engines exposed to fluctuating loads and extended operating temperatures common in commercial service.

The API CI-4 performance level is intended for high-speed, four-stroke diesel engines, particularly those operating with exhaust gas recirculation (EGR) systems where effective control of soot-induced oil thickening and oxidation is essential to sustaining engine durability and oil service life.

Key Features & Functional Benefits

• Effective soot control: Designed to manage soot levels associated with CI-4 and EGR diesel engines, helping limit viscosity increase and reduce abrasive wear during extended service intervals.
• Wear protection: Maintains oil film strength under sustained load to protect valve train components, piston assemblies, and bearings.
• Oxidation resistance: Limits sludge and deposit formation caused by heat and oxygen exposure, supporting cleaner engine operation.
• Viscosity stability: Resists shear and thermal degradation, contributing to predictable lubrication performance over the service interval.

These characteristics make the oil suitable for engines exposed to long operating hours, fluctuating loads, and harsh service conditions.

Applications & Suitable Engines

10W-40 Diesel – API CI-4 is recommended for a wide range of diesel-powered vehicles and machinery, including:

• Heavy-duty trucks and buses operating on highways under continuous load.
• Light commercial diesel vehicles and vans not equipped with diesel particulate filters (DPF) and not requiring low-SAPS engine oils, subject to manufacturer approval.
• Off-road and industrial diesel equipment, such as construction machinery, agricultural vehicles, and stationary engines.

For engines equipped with diesel particulate filters (DPF) or requiring low-SAPS specifications, manufacturer recommendations should always be followed, as API CI-4 oils may not be suitable in such cases.

When This Oil Should NOT Be Used

This product is not recommended for diesel engines equipped with diesel particulate filters (DPF) or for applications requiring low-SAPS specifications such as API CK-4 or FA-4 engine oils.

Performance Standards & Compliance

10W-40 Diesel meets the API CI-4 performance level, which emphasizes control of soot, piston deposits, valve train wear, oxidation, foaming, and viscosity loss due to shear. An additional practical advantage of this specification is backward compatibility, allowing use in applications where API CH-4, CG-4, or CF-4 oils are recommended, subject to OEM guidelines.

Base Oil Technology

The 10W-40 Diesel formulation utilizes advanced base oil technology combined with a balanced additive system to deliver thermal stability, controlled volatility, and consistent viscosity behavior. This base oil structure supports oxidation resistance and enhances additive performance, contributing to sustained engine protection and cleaner operation throughout the oil’s service life.

Packaging Availability

To support different operational scales, the product is available in multiple packaging options:
1L – 4L – 5L – 20L – 25L – Drum
This range allows efficient use in individual vehicle servicing, professional workshops, fleet maintenance facilities, and industrial applications.