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This one has me confused. The original Castrol Syntorq LT (repackaged by GM and Dodge) is supposedly 75W85 with whatever secret blend of additives to protect the carbon-fiber synchros the NV4500 came with.. but one of the suggested replacement fluids, the Mobil Delvac 50, is named that because it's 50W. I've seen the Delvac recommended in more than one place now including by a transmission builder out of TN and I'm just trying to make it make sense.You can use 75w-85w Mobil Delvac 50 GL-4 synthetic fluid.