The RTR Storm DOES NOT HAVE OIL in the diffs. The diffs do however have grease in them from the factory.

Some would say that it is not a good idea, but I ran a gallon of fuel through my RTR before tearing down, inspecting, cleaning and rebuilding my diffs. I saw no damage from running the car this way.

I did replace the grease with oil on rebuild.
I recommend 5000, 7000, 1000 wt silicone diff oil & new gaskets.

Refer to this thread for more info as we have already discussed this issue...