Fluid in the Maverick is used to cool primarily and lubricate (small amount). There is no traditional torque converter. It's not even a CVT, as it does not continuously variate.No you have to use OEM specific because the transmission uses the specific viscosity to not only lubricate but (depending on the transmission) as hydrologic power
Here is a great primer on the HF35 which the HF45 in the Maverick is based off of, just with more cooling capabilities.
Also some more info:
Engineering Fords new HF45 hybrid transmission (sae.org)
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