Mobil Delvac MX III 20W-50

Extra High Performance Diesel Engine Oil

Mobil Delvac MX III 20W-50

Mobil Delvac MX III 20W-50 is an extra high performance diesel engine oil that provides excellent lubrication of today's diesel engines promoting long engine life. This extra high performance has been proven in the field in a wide variety of industries, applications.

The advanced chemistry of this product provides outstanding performance in both modern, demanding low-emission diesel engines and older diesel engines operating on low or high sulphur fuel. Mobil Delvac MX III 20W-50 combines a blend of high performance base stocks with a balanced additive system to provide excellent control of oil thickening due to soot build-up and high temperatures as well as outstanding resistance to oxidation, corrosion, and high temperature deposits.


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 and retarded timing require improved oil performance in areas such as oxidation stability, soot dispersancy, and volatility. Mobil Delvac MX III 20W-50 is formulated from high performance base oils and a balanced additive system to contribute to optimum engine performance in modern diesel and gasoline engines as well as older models. The key potential benefits include:

FeaturesAdvantages and Potential Benefits
High thermal and oxidation stabilityHelps to reduce sludge build-up, deposits and viscosity increase
TBN reservesHelps to control deposit and acid neutralization
Stay-in-grade shear stabilityWear protection and viscosity control
Advanced detergency/dispersancyHelps to guarantee clean engines and long component life
Improved soot handlingHelps to improve viscosity control and used oil pumpability
Excellent low temperature propertiesStart-up wear protection
Component compatibilityLong gasket and seal life



Recommended by ExxonMobil for use in:

  • Naturally aspirated and turbo-charged diesel powered equipment from leading European, and American manufacturers
  • On-highway light and heavy-duty trucking
  • Off-highway industries including: construction, mining, quarrying, and agriculture


Specifications and Approvals

Mobil Delvac MX III 20W-50 has the following builder approvals: 
MB-Approval 228.1X


Mobil Delvac MX III 20W-50 is recommended by ExxonMobil for use in applications requiring: 


Typical Properties

Mobil Delvac MX III 20W-50 
SAE Grade20W-50
Viscosity, ASTM D 445 
cSt @ 40ºC152
cSt @ 100ºC18.3
Viscosity Index, ASTM D 2270135
Sulfated Ash, wt%, ASTM D 8741.2
Total Base # , mg KOH/g, ASTM D 289610.3
Pour Point, ºC, ASTM D 97-27
Flash Point, ºC, ASTM D 92                            236
Density @ 15ºC kg/l, ASTM D 4052                     0.891


Health and Safety

Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS's are available upon request through your sales contract office, or via the Internet. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.