Shell Rotella T4 15w40 meets Industry Standards

Rotella T4 15w40 – All Oils Are Not Created Equal

A sample of Mobil Delvac 1300 Super 15W-40 that we had tested, failed the Volvo T-13 test.

At Shell Rotella,® we believe in the strength of our technology. And one way we challenge ourselves is by putting our oils to the test, along with other oils on the market. In a required industry test completed earlier this year, a sample of Mobil Delvac 1300 Super 15W-40 did not meet API CK-4, nor the Cummins, Detroit Diesel, Mack or Volvo specifications which they claim to meet. Make sure you get what you’re paying for because a truck is more than just a truck, that’s why it deserves more than just any oil.

Questions and Answers:

Q- How did Shell Lubricants obtain the data on Mobil Delvac 1300 Super?
A- Shell conducts an ongoing benchmarking program on competitive products to assess their performance.
A- Shell procures samples of competitors’ products from the open market and runs a series of bench tests/laboratory testing and in some cases fired engine testing associated with API category. And where we conduct testing through third party laboratories, blind samples are submitted to prevent any bias in the results.
A- In the course of benchmarking products, we identified a potential weakness in oxidation performance of the Mobil Delvac 1300 Super 15W-40 relative to Shell Rotella T4 15W-40 and other
competitor 15W-40 products. Basis this, we decided to test Mobil Delvac 1300 Super in the API CK-4 standard oxidation engine test, the Volvo T-13.
Q- What were the results of the Mobil Delvac 1300 Super testing?
A- We ran a sample of Mobil Delvac 1300 Super 15W-40 in the Volvo T-13 engine test through an independent testing facility and found that the sample failed the requirements of the API CK-4
performance standards as well as the Cummins CES 20086 and Volvo VDS 4.5 and MACK EOS 4.5 performance standards.
Q- How did Mobil Delvac 1300 Super 15W-40 fail the requirements of the API CK-4, Cummins CES 20086,  Volvo VDS 4.5, and MACK EOS 4.5 specifications?
A- Mobil Delvac 1300 Super 15W-40 did not meet the oxidation and viscosity requirements of the Volvo T-13 engine test found in the API CK-4, Cummins, Volvo and Mack specifications.
A- Specifically, the product exceeds the maximum allowable oxidation increase over the 360-hour duration of the Volvo T-13 test, and exceeds the maximum allowable viscosity increase over the last 60 hours of the Volvo T-13.
Q- Why is oxidation important?
A- Newer engines are running hotter and require improved oxidation resistance, which is why the more stringent oxidation requirements were added to the new API CK-4 requirements
A- Excessive oxidation leads to thickening of the oil, which can reduce the oil’s ability to flow to critical engine parts, especially in lower temperatures. Thickening of the oil can also contribute to reduced fuel economy.
A – Excessive oxidation causes the oil to become acidic which can lead to internal engine corrosion and potentially a shorter engine life.
A- Late-model engines require a minimum-level in their oxidation resistance, the Mobil Delvac 1300 Super 15W-40 sample does not meet these minimum requirements.
A- Oxidation resistance is important in optimizing/maximizing drain/service-interval life.
Q- What should I do if I have any questions about the performance of Mobil Delvac 1300 Super 15W-40?
A- We would recommend customers that are using Mobil Delvac 1300 Super 15W-40 and have questions about performance, warranty, etc. to speak to their OEM.
Q- What equipment and engines are impacted?
A- All engines from manufacturers that recommend or require API CK-4 performance are impacted.
Q- Where can I find more information?
A- Please visit for more information.


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