DIOL 9 RD 40 and 2040

Mobil commercial-vehicle-lube , South Korea

Railroad Crankcase Oils

Product Description

DIOL 9 RD series oils are premium heavy-duty crankcase lubricants for locomotive diesel engines. These products are designed to meet the severe service demands imposed by the latest railroad diesel locomotive engines. An Electro-Motive Diesel (EMD) and General Electric (GE) endorsed additive system provides excellent engine protection, oil consumption control and oil drain interval extension capability.


Features and Benefits

 •Zinc Free - Excellent Silver Bearing Lubricity

 • Enhanced Oxidation, Sludge-Soot Handling and Viscosity Control

 • Excellent Deposit, Corrosion and Wear Control

 • Formulated for use with low sulfur and ultra-low sulfur diesel fuels

 • Extended oil drain intervals and high locomotive utilization rates

 • Chlorine Free



DIOL 9 RD oils are formulated to an LMOA Generation 5 quality level with an engine manufacturer endorsed additive package. They meet the requirements of for all EMD and General Electric diesel locomotives.


The newest improvements in General Electric and EMD engines are modified piston rings and cylinder liners that have significantly reduced oil consumption. This drastic reduction in the amount of fresh oil makeup, plus the higher operating temperatures of the newer engines, places an extra burden on the oil. The good base number retention and improved oxidation inhibition of DIOL railroad oils provide excellent service under these conditions, even with extended oil drain intervals.


Specifications and Approvals

This product has the following approvals:

9 RD 40

EMD Domestic Common Additive Approach (recognition ltr on file)


GE Transportation, A Wabtec Company LMOA Gen 4 LL - Fundamental Approval (letter on file)



Properties and Specifications


9 RD 40

9 RD 2040

DIOL 9 RD 20W-40


SAE 40



Ash, Sulfated, mass%, ASTM D874




Chlorine, ppm, ASTM D6443




Flash Point, °C, ASTM D92




Flash Point, Cleveland Open Cup, °C, ASTM D92




Kinematic Viscosity @ 100 C, mm2/s, ASTM D445




Kinematic Viscosity @ 40 C, mm2/s, ASTM D445




Pour Point, °C, ASTM D97




Total Base Number, mgKOH/g, ASTM D2896




Viscosity Index, ASTM D2270




Zinc, mg/kg, ASTM D5185





Health and Safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com/psims/psims.aspx

All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.


Mobil Korea Lube Oil Inc.

Level 22, Seoul Square bd., Hangang-daero, Jung-gu, Seoul, Korea


Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification.  Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations.  The information contained herein is subject to change without notice. All products may not be available locally. For more information, contact your local ExxonMobil contact or visit www.exxonmobil.com
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