Mbx5t brushless diff oil recommendation/help
 

I have a mbx5t with a tekno conversion i just got i finished and it would not pull the front wheels or anything.... I just bash with it i have a mmm 2200kv 17/48 gearing and 4s... I was kinda dissapointed in the performance so i took out the center diff and checked it there was basicly no oil in it.... I put 10,000 in it and WOW what a big diffrence... But after seeing that there was no oil in the center i figured the fron and rear was no better... So i guess for bashin what would you recommend for front and rear oil? I am actually 100% happy with how it is now it turns and hooks up amasing but i just want to check and service the diffs. Thanks in advance and btw most of the time it will be on pavment And grass and rock...