15W-40 Diesel Engine Oil

This grade is designed for applications where robust soot control, oxidation resistance, and viscosity stability are required, without the need for low-SAPS formulations intended for modern aftertreatment systems.

Developed using high-quality mineral base oils and a carefully balanced additive system, the formulation delivers effective soot control, oxidation resistance, and deposit management, helping maintain engine cleanliness and protect critical components during extended service intervals.

Key formulation characteristics include:

• Formulated with selected mineral base oils to provide stable viscosity performance and reliable lubrication under variable load and temperature conditions.
• Enhanced oxidation resistance to control oil thickening and limit sludge, varnish, and deposit formation during extended operation.
• Optimized detergent and dispersant additives to manage soot loading, maintain piston cleanliness, and reduce internal deposits.
• Anti-wear protection designed to safeguard critical engine components, including piston rings, camshafts, and valve train assemblies, under high-load operation.
• Formulated to meet API CH-4 and CI-4 performance requirements and suitable for diesel engines equipped with EGR systems, when used in accordance with engine manufacturer recommendations.

This multigrade diesel engine oil is particularly suitable for mixed fleet operations, covering both older and mid-generation diesel engines. Its backward compatibility allows use in applications originally specifying earlier API categories such as CG-4 and CF-4, simplifying lubricant selection while maintaining reliable engine protection.

15W-40 Diesel is recommended for use in heavy-duty trucks, buses, construction, agricultural, and industrial diesel equipment operating under severe service conditions.

Key Features and Benefits

The formulation of 15W-40 Diesel focuses on maintaining viscosity stability across a wide temperature range while delivering consistent engine protection. The SAE 15W-40 viscosity grade provides reliable cold-start flow characteristics while maintaining a stable lubricating film at normal and elevated operating temperatures, particularly in heavy-duty diesel engines operating in warm to moderate climates.

A robust detergent–dispersant system effectively controls soot generated during combustion, helping prevent sludge formation and piston deposits. This contributes to improved engine cleanliness and reduced wear on critical components such as piston rings, camshafts, and valve train assemblies.

The oil demonstrates good oxidation resistance, limiting viscosity increase and deposit formation under sustained thermal stress. Anti-wear additives further enhance protection in heavily loaded diesel engines, supporting long-term mechanical reliability. This formulation approach reflects industry practices applied by leading lubricant manufacturers.

Applications

15W-40 Diesel is suitable for a wide range of diesel-powered vehicles and equipment, including:

• Heavy-duty commercial vehicles: trucks, buses, and fleet vehicles operating in long-haul, regional, or urban duty cycles
• Off-road and construction machinery: excavators, loaders, bulldozers, agricultural tractors, and generators
• Light-duty diesel vehicles: where manufacturer recommendations permit the use of this viscosity grade and performance level

The product is compatible with naturally aspirated and turbocharged diesel engines, including engines equipped with Exhaust Gas Recirculation (EGR) systems that do not require low-SAPS oils for aftertreatment devices such as DPFs. This product is best suited for fleets operating pre-2010 diesel engines or applications where diesel particulate filters (DPFs) are not required or specified.

Standards and Specifications

This grade meets or aligns with the following performance requirements:

• API CI-4 / API CH-4, with backward compatibility to API CG-4 and CF-4
• Performance philosophy broadly aligned with legacy ACEA E7, E5, and E3 requirements, where applicable to non-DPF diesel engine designs.

These standards ensure reliable control of soot, oxidation stability, wear protection, and piston cleanliness in heavy-duty diesel engines operating under severe service conditions.

Base Oil Technology

15W-40 Diesel is formulated using high-quality mineral base oils selected for their thermal stability and compatibility with heavy-duty additive systems. This base oil choice provides a balanced combination of cost efficiency, durability, and performance, particularly suitable for warm climates and high-load operating environments.

Packaging Options

To support different operational needs, the product is available in multiple packaging formats:
1L – 4L – 5L – 20L – 25L – Drum
This range ensures flexibility for individual vehicle owners, workshops, and large fleet operators.