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You do realize that Navistar International manufactures a whole range of vehicles, and not just one, right?
As for what to use, it depends on your transmission. If you have an Eaton-Fuller transmission, then they recommend you use either full synthetic 50W oil or 80W mineral oil. I'd go with the 50W synthetic.

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9y ago
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Q: What type of transmission fluid do I use in a 2015 international navistar?
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