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15W-40 is the generally recommended weight to use, while the API rating MUST be CJ-4 for 2008 and newer engines, while CI-4 can be used for 2007 and older engines. You MUST use diesel oil, as oil intended for gasoline engines is not intended to withstand the higher temperatures of diesel engines.

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9y ago
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Q: What oil weight to use in 5.9L cummins?
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