Fury Fury V2 Mega Differential fluid or grease?

[Sonic_striker]

Hi,
I just bought an old Fury V2 I think and when doing maintenance I saw it had grease in the diff.
However, are these things able to hold fluid? Because when driving, it is very easy to let 1 wheel turn like crazy. I can’t find any info on this so maybe someone can shed some light on this?

 

[332_RC]

I put 30k Kyosho blue diff grease in my Gorgon. Feels like grease, looks like silicone. Made a huge difference.