Recently, a major diesel engine manufacturer has stated that the recommended oil weight for their heavy duty diesel engines is 10w30. Most of their dealers, of which one I am employed by, use 15w40. Changing it to 15w40 as soon as I get home. Regarding the 10w30 or 5w30 discussion, the full synthetic diesel oils in this grade will do just fine. A newer, tight engine can use a 30 weight oil and not have any issues. I had my motor overhauled the beginning of this year and cat filled it with 10w30.
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