Oil used in motor/axle/differential assembly

[JHC283]

What type and viscosity of oil is used in the differential assembly on these trucks? I looked online and in the manual. I’ve seen some recommended service intervals (90,000) but no more information on it. Anyone know or can point me in the right direction? Thanks

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[Maquis]

The 2023 manual says 10 years/150K miles.
The fluid spec isn’t shown.

 

[JHC283]

The 2023 manual says 10 years/150K miles.
The fluid spec isn’t shown.

I have a 2024 Flash bought December 6th, has over 7000 miles on it now…. Put a 1000 miles a week on it, 150,000 Will be here long before 10 years!

 

[TaxmanHog]

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