2018 gmc terrain rear diff fluid?

Joined
Oct 6, 2008
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1,595
Location
NC
Does anyone know what fluid goes in the rear diff of a 18 terrain. No mention of it in manual at all. Amsoil calls for power steering fluid but cannot find gm documentation anywhere. Strangely the dealership said they didn't know either.

Any advice is appreciated.
 
Thank you, i kept hearing folks say other fluids. I think there is some confusion because there is a pentosin CHF11 fluid back there too and I think some were getting that confused with the actual gear oil.
 
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