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  1. #1

    Default Duramax Diesel Manual needed

    Hi Guys

    We bought a used 2007 chevy dually diesel. We have the warranty manual and the owners manual, but the extra Duramax diesel manual was missing.
    I called GM, which has always been hopeless, I asked if i could download a copy from their website, this is not an option according to them even thou we found it for a 2011.
    We were given a number to ring to buy a copy , which I guess as a last resort we will have to do, but surley in this day and age we could download it from somewhere.
    Any suggestions please.
    The mainthing we need to know, is which oil to use in our engine and how much in total it holds.
    I am sure someone here must know that, it is the late 2007 model LMM engine,

    Thanks for your help


  2. #2


    When looking for what kind of engine oil to use, look for these two things:

    • CJ-4 or CI-4
    Oils designated as API CJ-4 or CI-4 are recommended for your vehicle. The CJ-4 or CI-4 designations may appear either alone, together, or in combination with other API designations, such as API CJ-4/SM. These letters show American Petroleum Institute (API) levels of quality.

    Notice: Use only engine oils that have one of these designations, CJ-4 or CI-4, for the diesel engine. Failure to use the recommended oils can result in engine damage not covered by your warranty.

    • SAE 15W-40
    As shown in the viscosity chart, SAE 15W-40 is best for your vehicle. However, you can use SAE 10W-30 at temperatures above 0F (−18C). When it is very cold, below 0F (−18C), you should use SAE 5W-40 to improve cold starting. 5W-40 is not recommended for use at high temperatures, above 100F (38C). These numbers on the oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 10W-40 or SAE 20W-50.

    The capacity for the engine oil with filter is 10.0 quarts. This is found the in 2007 Diesel Manual. For more information specific to your engine, I will need your VIN sent to me in a private message. Thank you.

    Tricia, GM Customer Service.

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