Product Description

Mobil Delvac HD 10W-40 is a semi-synthetic high performance diesel engine oil engineered to provide lubrication to modern, high performance, low emissions engines used in severe applications. This engine oil is designed using high performance base oils which provide excellent low temperature fluidity, high temperature viscosity retention and volatility control. The proven advanced additive system has been expertly engineered to help towards long engine life and maintain the efficiency of emission reduction systems including the Diesel Particulate Filter (DPF).

Features and Benefits

High output, low emission engines significantly increase demands on engine lubricants. Tighter engine design, use of inter-coolers, and turbochargers increase thermal stresses on the lubricant. Low emission engine technologies such as higher fuel injection pressure, retarded timing and aftertreatment devices all require improved oil performance in areas such as oxidation stability, soot dispersancy, volatility and compatibility with aftertreatment devices. The advanced technology in Mobil Delvac HD 10W-40 delivers high performance, long drain interval capability and protection of exhaust systems including those fitted with Diesel Particulate Filters (DPF). The key benefits include:

Features Advantages and Potential Benefits
Protection against oil thickening, high temperature deposits, sludge build-up and, oil degradation Provides capability for long drain intervals
Helps to protect against ring sticking
Excellent anti-wear, anti-scuff properties and bore polishing and corrosion protection. Helps towards long engine life1
Stay-in-grade shear stability. Very low volatility Helps to reduce viscosity breakdown and oil consumption under heavy duty, high temperature operating conditions
Low ash, sulfur and phosphorous levels Helps to protect exhaust systems devices like those fitted with DPF
Good low temperature properties Helps to improve pumpability and oil circulation

1 Well formulated oils, like Mobil Delvac, that meet or exceed industry or OEM specifications, can help protect engines. Consult OEM for optimum fluid selection. Actual results may vary depending on OEM requirements, type of engine and its maintenance, application and service conditions, and prior lubricant used.


  • Heavy Duty Diesel Engines including Euro V/VI Modern Low Emissions Vehicles, Utilizing Technologies such as Diesel Particulate Filter (DPF), Selective Catalytic Reduction (SCR), Continuously Regenerating Traps (CRT), Diesel Oxidation Catalysts (DOC) and Exhaust Gas Recirculation (EGR)
  • Heavy Duty Diesel Engines using low sulfur diesel fuels and many biodiesel fuel formulations
  • Naturally Aspirated and Turbo-Charged Diesel Powered Equipment
  • On-Highway Short-Haul and Long-Haul Trucks and Buses2 Please refer to the owners handbook for OEM application requirements and oil drain intervals for your vehicle or equipment

Specifications and Approvals

Mobil Delvac HD 10W-40 meets or exceeds the requirements of:
DAF Extended Drain X
Mobil Delvac HD 10W-40 has the following builder approvals:
MB-Approval 228.51 X
MAN M 3477 X
MTU Oil Category 3.1 X

Typical Properties

Mobil Delvac HD 10W-40
SAE Grade 10W-40
Viscosity, ASTM D 445
mm2/s @ 40ºC 87.6
mm2/s @ 100ºC 13.8
Viscosity Index, ASTM D 2270 160
Sulfated Ash, wt%, ASTM D 874 0.96
Total Base Number, mg KOH/g, ASTM D 2896 9.3
Pour Point, ºC, ASTM D 97 -39
Flash Point, ºC, ASTM D 92 226
Density @ 15ºC kg/l, ASTM D 4052 0.860

Health and Safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @


It cannot be guaranteed that the product information given above is up to date. For the latest version of the Product Data Sheet we refer to the product library of ExxonMobil.