Differential Oil

[nightbreed]

What is the purpose of silicone diff oil and what do filling the front, centre and rear diffs with different viscosities do?

For the purpose of Farmway bashing with a Hyper 7 Pro, what is recommended?

Thank you!

[fuse]

5k front
7k center
1 k rear

[nightbreed]

Thank you!

But why? Why not 5 5 3? or 5 7 10? Or anything else?