ESP-0W-40 Synthetic

Cold weather protection now more powerful than ever

Mobil Delvac 1™ ESP 0W-40 Synthetic High Performance Heavy Duty Engine Oil helps extend engine life and improve fuel economy in modern diesel engines operating in severe applications. On bitterly cold mornings, this lubricant is almost instantly active, protecting engine components against premature wear and eliminating the need for long and non-productive warm-ups.

Now Mobil Delvac 1 ESP 0W-40 has been reformulated to deliver even better performance in its ability to pumpand flow easily through filters at low temperatures.

Close ties to original equipment manufacturers (OEMs) worldwide enable our researchers and engineers to stay ahead of ongoing changes in engine design. New engine oil formulations are rigorously tested – in the laboratory and in the field.

New formulation Mobil Delvac 1 ESP 0W-40 was field-proven in northern Alberta in V-20 heavy duty diesel engines powering large haul trucks in an oil sands mine.

Test results confirm that new formulation

Mobil Delvac 1 ESP 0W-40 synthetic diesel engine oil delivers improved performance, with good viscosity and TBN retention, low wear metals, and exceptional wear protection at low temperatures.

Cold Start testing (please see charts below) showed positive results after a 16-hour shutdown at -10° C (14° F). Mobil Delvac 1 ESP 0W-40 exhibited good cold temperature performance in all test units. Filters maintained optimal flow throughout the field test.

Confirmed by five months of field testing: New formulation Mobil Delvac 1 ESP 0W-40 delivers excellent cold weather performance.

New formulation Mobil Delvac 1™ ESP 0W-40 delivers more powerful cold weather protection than ever before – and test results confirm it. Three V-20 off-highway diesel engines powering large haul trucks took part in the five-month test at a northern Alberta oil sands mine. Each truck completed three 500 hour oil drain intervals, with oil withdrawn for analyses after 250 and 500 hours. The results confirm the improved performance of new formulation Mobil Delvac 1 ESP 0W-40 synthetic diesel engine oil, showing good viscosity, TBN retention, low wear metals and exceptional low temperature MRV (mini rotary viscometer) results.

This Cold Start Test measures both oil temperature and pressure in the critical early moments following start-up. Note the immediate rise in oil temperature, confirming the ability of New formulation Mobil Delvac 1 ESP 0W-40 to warm up quickly. Note as well the constant rise in oil pressure. With Mobil Delvac 1 ESP 0W-40 there is no metal-to-metal contact after start-up.


This test measures oil pressure differential across the oil filter. In some systems, 24 PSI would be considered at the high end, but since this unit had no by-pass it was well within range. Note that, as the oil temperature rises, the filter differential drops. This confirms that the oil is flowing smoothly through the filter at start-up and at operating temperature.

In addition to superior cold weather performance, New formulation Mobil Delvac 1 ESP 0W-40 delivers:

  • Year-round versatility, one engine oil for year-round protection, improved productivity and long engine life
  • Inherent stay-in-grade shear stability, providing wear protection and reduced oil consumption; maintaining viscosity in severe, high temperature service
  • The potential for extended oil drain intervals, improving operating efficiency and lowering the overall cost of equipment ownership.

New formulation Mobil Delvac 1 ESP 0W-40 continues to meet or exceed the following industry and builder specifications:

  • API CJ-4 / CI-4 PLUS / CI-4 / CH-4 / SM
  • Caterpillar ECF-3
  • Cummins CES 20081, 20076
  • Mack EO-N Premium Plus 03

Answers to your questions about new formulation Mobil Delvac 1 ESP 0W-40

Q. Why did this formulation change?

A. Original Equipment Manufacturers (OEMs) are constantly upgrading engine and component technology. Close ties between these OEMs and our researchers and engineers enable us to keep our lubricant formulations ready for these changes, enabling our customers to take full advantage of improved engine protection and performance.

Q. What is different about new formulation Mobil Delvac 1 ESP 0W-40?

A. Mobil Delvac 1 ESP 0W-40 synthetic diesel engine oil continues to deliver exceptional cold temperature performance but has been engineered to enhance cold temperature filterability. It carries the same approvals and is completely compatible with the previous formulation.

Q. Will I notice a difference in my oil analysis results?

A. No, you will see no difference in your oil analysis results.

Q. Are there any concerns with compatibility between new formulation Mobil Delvac 1 ESP 0W-40 and other Mobil Delvac engine oils?

A. No. The new formulation is fully compatible with other Mobil Delvac engine oils.

Q. How does Mobil Delvac 1 ESP 0W-40 differ from SAE 5W-40 grade oil?

A. New formulation Mobil Delvac 1 ESP 0W-40 is engineered to provide exceptional protection in temperatures as low as -40°C, greater protection than any SAE 5W-40 oil. This level of performance makes it well suited for severe cold temperature applications, such as mining, forestry and construction.

Q. Can we top off the engine using the new formulation?

A. Yes, you can. However, to obtain the full benefit of the new formulation, we recommend a complete oil change.

Q. Is there a change in the colour of the lubricant?

A. No. Nothing in the reformulation has caused a change in colour.

Q. What do you recommend for transitioning in bulk storage?

A. We recommend no more than a 10% commingling in the tank in order to enjoy the full benefits of improved performance in new formulation Mobil Delvac 1 ESP 0W-40.

Distributor is an independent business and not an affiliate of Imperial Oil.

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