Imperial describes how new CK-4 and FA-4 oils will benefit fleets

  • Imperial describes how new CK-4 and FA-4 oils will benefit fleets

    Imperial describes how new CK-4 and FA-4 oils will benefit fleets

    Recently, Imperial Oil introduced its lineup of enhanced Mobil Delvac™ diesel engine oils, which are formulated to meet or exceed the API’s CK-4 and FA-4 category requirements.

    It consists of improved versions of the current Mobil Delvac offerings, including Mobil Delvac 1300 Super, an advanced synthetic Mobil Delvac 1™ ESP 5W-40, as well as the new premium synthetic blend Mobil Delvac Extreme oils.

    With the API to start licensing new CK-4 and FA-4 oils on December 1, Today’s Trucking caught up with Dave Stewart, Lead Automotive Products Technical Advisor, Imperial Fuels and Lubricants.

    Below is a condensed version of the discussion.

    Q1: How will new Mobil Delvac oils compare with previous CJ-4 versions?

    Stewart: In extensive testing, and comparing our API CK-4 and API FA-4 engine oils to our CJ-4 Mobil Delvac 1300 Super and Elite formulations, we have achieved:

    • 80 percent improvement in high temperature viscosity control, helping to protect engines from severe operating conditions;*
    • 50 percent improvement in oxidation resistance, helping to enhance engine life by reducing deposit formation of sludge and varnish;* and
    • 20 percent improvement in wear protection, which can help enhance engine durability and keep engines running more efficiently for longer periods.

    These outstanding results can be credited to the extensive testing and research we have done to support the development of these oils. To date, we have conducted more than 50 million kilometers of on-road testing with leading fleets and equipment manufacturers.

    While both CK-4 and FA-4 oils provide these improvements, the FA-4 oils, designed for engine model years 2017 and newer, will provide additional potential for fuel economy benefits.ˠ

    Ultimately, these new Mobil Delvac™ oils will provide balanced performance between the improvements in wear protection and fuel economy.

    Q2: What steps should fleet owners take as they switch to the new CK-4 and/or FA-4 oils?

    Stewart: It’s important for fleet owners to know that PC-11 will NOT change many of the best practices that help drive their success.

    And, the only change that most fleet owners will see is how CK-4 or FA-4 oils can deliver better performance than a previous CJ-4 counterpart.

    As they transition to CK-4 or FA-4 oils, fleet owners should work closely with their lubricant supplier to ensure they choose the right lubricant based on specific engines and common operating conditions.

    Q3: Will the new oils produce different oil analysis results? And how much data is needed before a fleet owner tries to optimize drain intervals?

    Stewart: There will be some slight variations in oil analysis results between CJ-4 and CK-4/FA-4 oils, such as additive levels.

    But, the biggest testing results fleet owners will see are various improvements in oxidation stability and enhanced viscosity control.

    Before considering oil drain optimization programs, we’d suggest that fleet owners take advantage of our Mobil Serv™ Lubricant Analysis and have at least two or three oil drains using the OEM recommended intervals. This will help set an appropriate baseline to evaluate engine performance with the new oils and determine if an optimized oil drain interval program can be started.

    Want to know how new Mobil Delvac CK-4 and FA-4 oils will compare to the previous CJ-4 ones you used, visit

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