Diesel Engine Oils
Caltex Delo® provides heavy-duty motor oil for excellent reliability. Delo’s proven performance will help protect vital engine parts from stem to stern.
DELO® 400 MGX SAE 15W-40
Product description
Delo 400 MGX SAE 15W-40 is an API CJ-4 heavy duty engine oil specifically formulated for on-highway and off-highway applications using either High Sulfur or Low Sulfur Diesel and can also provide protection for newer compliant low emission diesel engines with Selective Catalytic Reduction (SCR), Diesel Particulate Filter (DPF) and Exhaust Gas Recirculation (EGR). It is fully compatible with previous diesel engine models and previous API Oil Service Categories including: API CI-4 PLUS, API CI-4 and API CH-4.

Customer Benefits
- Minimized operating costs
Exceptional soot dispersancy and wear control. Cylinders, pistons, rings, and injectors are well protected against wear and corrosion, providing optimum service life and minimal maintenance. Contributes to maximum vehicle utilization and minimal downtime. - Excellent emission control system life
Provides optimum Diesel Particulate Filter (DPF) life for minimal downtime and cleaning, thus managing your maintenance costs. - Managed inventory costs
Backward compatible with previous API Oil Service Categories and engine models. Suitable for use in four-stroke gasoline and naturally aspirated, turbocharged and modern electronically controlled / low emission diesel engines calling for an SAE 15W-40 heavy duty motor oil.
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Applications
Delo 400 MGX SAE 15W-40 is recommended for naturally aspirated and turbocharged four-stroke diesel engines in which the API CJ-4, CI-4 PLUS, CI-4 categories and SAE 15W-40 viscosity grade are required by the manufacturers. It is formulated for engines operating under severe service and a wide range of climatic conditions. This product is recommended for use in:
- Commercial road transport, including the latest engines fitted with exhaust cleanup devices of all types.
- Vehicles meeting the most recent exhaust emissions standards, including US EPA 2002 and 2007, Euro IV, V and VI, and Australian ADR 80/02 (for medium duty) and ADR 80/03 (for heavy duty).
Delo® Gold Ultra SAE 15W-40
Product description
Delo® Gold Ultra is a high performance, multigrade, heavy-duty diesel engine oil specifically designed to lubricate a wide range of engines requiring API CI-4 or ACEA E7 performance lubricants. Delo Gold Ultra is formulated with ISOSYN® technology.

Customer Benefits
- Reduces maintenance costs – ISOSYN® technology, including a combination of high performance hydrocracked base fluids and carefully balanced metallic detergent and ashless dispersant additive system, provides excellent overall engine cleanliness in all service conditions. ISOSYN® technology also confers the high degree of soot dispersancy required to maintain oil drain intervals in modern engine designs. Highly effective oxidation stability protects against the formation of gums and varnish at elevated temperatures.
- Prolongs engine life – High efficiency dispersant combination plus proven metallo-organic anti-wear additive system provides excellent protection against wear of critically loaded components under all operating conditions. Multigrade viscosity provides additional protection against wear at start-up and under high temperature operating conditions.
- Preserves full power and performance – Outstanding metallic detergent additive system preserves full power and performance by providing excellent upper-ring-belt deposit control under the high temperatures encountered in turbocharged diesel engines.
Applications
- Mixed fleets of diesel engines (high speed, four-stroke, turbocharged or naturally aspirated)
- Four-stroke gasoline engines in mixed fleets of diesel and gasoline engines
- Commercial road transport
- Off-highway vehicles and plant
DELO® 1000 MARINE 30
Product description
Delo® 1000 Marine is a high quality engine oil developed for use in a wide variety of medium speed trunk piston engines, including the latest design, high output engines burning marine diesel oils. Available in SAE grades 30, 40

Customer Benefits
- Maintains power output – The detergent/dispersant additive system provides control of high temperature deposits in areas such as the undercrown of the piston and the piston ring belt area, enabling piston rings to function efficiently.
- Prolongs oil life – Base Number (BN) level and superior alkalinity retention characteristics maintain adequate BN to ensure corrosive acids formed by the combustion of fuel sulfur are effectively neutralized, thereby minimizing liner wear.
- Efficient purifying system performance – Excellent water separation characteristics enable water to be centrifuged out with essentially no loss of additive.
Applications
Features
DELO® 1000 MARINE 40
Product description
Delo® 1000 Marine is a high quality engine oil developed for use in a wide variety of medium speed trunk piston engines, including the latest design, high output engines burning marine diesel oils. Available in SAE grades 30, 40

Customer Benefits
- Maintains power output – The detergent/dispersant additive system provides control of high temperature deposits in areas such as the undercrown of the piston and the piston ring belt area, enabling piston rings to function efficiently.
- Prolongs oil life – Base Number (BN) level and superior alkalinity retention characteristics maintain adequate BN to ensure corrosive acids formed by the combustion of fuel sulfur are effectively neutralized, thereby minimizing liner wear.
- Efficient purifying system performance – Excellent water separation characteristics enable water to be centrifuged out with essentially no loss of additive.
Applications
Features
Taro DP Series
Product description
Taro® DP Series lubricants are high-performance, medium- to high-BN, diesel engine oils for medium and high-speed trunk piston diesel engines. Taro DP Series lubricants are specially developed for use in medium-speed, trunk piston diesel engines burning residual fuels with a maximum sulphur content up to 4%. Taro 20 DP can also be used in combination with marine diesel or gas oil. Taro DP Series lubricants are blended from high-quality base oils and additives that provide an extra margin of protection against ring sticking, piston deposits and wear under the most severe operating conditions.

Customer Benefits
Taro 20 DP delivers value through:
Wear Protection
- High BN levels control cylinder liner wear effectively and protect bearings from corrosion. High-performance, antiwear additives provide excellent protection against adhesive wear for cams, camshaft and bearings. Taro DP Series lubricants also provide a high degree of water tolerance and antifoam protection
Detergent/Dispersant Properties
- Keeps crankcases and oil control rings clean.
- Prevents deposit formation throughout the engine.
- Reduces lube oil filter blockage.
- Effectively handles insolubles.
Oxidation Stability
- Oxidation inhibitors protect the oil against high thermal stresses, protect engine parts from corrosion and reduce undercrown deposits while promoting extended lubricant life.
Features
Taro DP Series lubricants have very good viscosity control when used in severe hightemperature service, and their excellent BN retention characteristics prevent corrosive wear over long periods of operation. The unique detergent and dispersant additive system provides outstanding piston cleanliness as well as control of fuel contaminants. This results in extreme reduction of both “hot” (piston lands and grooves, piston undercrown, purifier preheaters) and “cold” (crankcase, cambox, rocker area, fuel pumps, purifier bowl) deposits. Taro DP Series lubricants provide a high degree of water tolerance and have good water separation and base retention properties.
Applications
Taro DP Series lubricants are recommended for all types of trunk piston diesel engines burning 1) marine diesel oil or low sulphur heavy fuels with a sulphur content up to 2% [Taro 20 DP]; or 2) residual fuels with a maximum sulphur level of 4% [Taro 30 DP]. Taro DP Series lubricants are approved by all major OEMs.













