Caltex Delo® Gold Ultra SAE 15W-40 Diesel Engine Oil – A High-Performance Lubrication Solution for Heavy-Duty Engines

Lubricants for commercial transportation

10/12/2025

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Delo® Gold Ultra SAE 15W-40 is a high-quality, multi-grade heavy-duty diesel engine oil developed to meet the lubrication requirements of modern engines requiring API CI-4 or ACEA E7 performance levels. The product is suitable for a wide range of diesel engines, including those equipped with Exhaust Gas Recirculation (EGR) and/or Selective Catalytic Reduction (SCR) systems, which are widely used in today’s commercial vehicles and industrial machinery.

ISOSYN® Technology – The Foundation for Superior Performance

Delo® Gold Ultra is formulated with ISOSYN® Technology, combining highly refined hydrocracked base oils with an optimally balanced, ashless detergent–dispersant additive system. This technology effectively controls sludge formation and keeps internal engine components clean throughout operation, even under severe and continuous working conditions.

Additionally, the product’s excellent oxidation stability helps minimize varnish and sludge formation at high temperatures, extending oil drain intervals and reducing maintenance costs for operators. This is particularly important for transport fleets, long-haul operations, or industrial machinery running under heavy loads for extended periods.

Comprehensive Engine Protection and Extended Service Life

Delo® Gold Ultra SAE 15W-40 is fortified with a metal-organic anti-wear additive system combined with highly effective dispersants to provide optimal protection for critical high-load components such as the crankshaft, camshaft, piston rings, and bearings. Its ability to maintain stable viscosity across a wide temperature range ensures effective lubrication during cold starts while maintaining a robust oil film at high operating temperatures.

With its multi-grade SAE 15W-40 characteristics, the product reduces friction, minimizes wear, and contributes to extending overall engine life—even under severe operating conditions or prolonged heavy-load applications.

Maintaining Engine Power and Performance

The superior metal-based detergent additives in Delo® Gold Ultra help prevent deposit formation in piston ring areas and the combustion chamber—zones typically exposed to extremely high temperatures, especially in turbocharged diesel engines. This allows the engine to maintain proper sealing, stable compression, and full designed power output throughout the oil’s service life.

Minimizing deposit formation not only improves engine performance but also contributes to optimized fuel economy, enhancing operational efficiency for users.

Applications

Delo® Gold Ultra SAE 15W-40 is suitable for mixed fleets operating various diesel engine types, including high-speed engines, four-stroke engines, turbocharged engines, and naturally aspirated engines. The product can also be used in four-stroke gasoline engines within mixed fleets, following engine manufacturer recommendations. It is an ideal choice for road transport vehicles, heavy-duty trucks, buses, construction machinery, and high-load industrial equipment.

Authorized Supplier of Genuine Delo® Gold Ultra in Vietnam

To ensure you purchase genuine Delo® Gold Ultra SAE 15W-40 with full certification and traceable origin, customers can contact Viet Duc Joint Stock Company – the strategic distributor of Chevron/Caltex in the Vietnamese market.

With long-standing experience in distributing industrial and marine lubricants, Viet Duc JSC not only supplies 100% genuine Chevron/Caltex products but also provides technical support and in-depth lubrication consulting tailored to each type of equipment and operating condition. This helps customers select the correct product, optimize maintenance costs, and extend equipment lifespan.

Viet Duc JSC, together with Chevron/Caltex, ensures stable supply, consistent product quality, and professional after-sales services for transport companies, factories, industrial zones, and large-scale fleets across Vietnam.

Viet Duc Joint Stock Company – Strategic Distributor of Caltex in Vietnam

With more than 24 years of experience in industrial, marine, and transportation lubricants, Viet Duc JSC is currently the strategic distributor of Caltex (Chevron Lubricants) in Vietnam. The company supplies the full range of Caltex lubricants for the transportation sector, manufacturing–processing industries, thermal and hydropower plants, mining operations, and maritime applications.

Driven by a business philosophy centered on quality, transparency, and long-term partnership, Viet Duc JSC provides customers with:

100% genuine products, directly imported with full CO, CQ, and MSDS documentation
In-depth technical consultation based on Chevron Global standards
Regular used-oil analysis services to optimize equipment life and reduce maintenance costs
Extensive warehousing and logistics systems enabling fast delivery to major ports and industrial zones
A highly experienced technical and commercial team offering training, workshops, equipment surveys, and tailor-made lubrication solutions

Thanks to consistent professionalism over many years, Viet Duc JSC has become a trusted partner for major enterprises in maritime, shipbuilding, heavy industry, logistics, oil & gas, mining, cement, steel, and long-haul transportation sectors in Vietnam.