Center dif oil weight?

[spiftacu1ar]

Ok, so after a long time, I was able to get on the block for one of Mikes BL center diff mounts for the FLM ext. LCG TVP'. Naturally, I also ordered a slipperential. Having never owned a truck with a center diff, I have no idea where to begin. I know a lot of buggies and truggies run 10k-20k oil, but i have no idea what to use for the savage. I would assume it woudl need must thicker oil, since it is heavier and has big wheels (running big joes). I did some research, and found that the revo uses 100k wt center diff oil.

Any suggestions?

My setup (what I think is relevant info to the question):
tekin rx8 w/4038 1550kv motor
CEN diffs
big joe or 40 series road rage tires (depending on surface).
Overall, this truck is on the heavier side, with alum bulks and towers.