I've got zero leaks so far after a couple of weeks runtime with the diffs. I have Ultimate Racing 5000 oils front and 1000 rear, seems to work fine so far
Compared to my previous setup (front one-way and a ball diff rear) I am able to drive the cars a lot more aggressively and have a lot more control over the car in the air. I realize, of course, that this partly (even mostly) due to having a front diff instead of one-way. Anyway, I have messed up zero jumps with these, which is nice.
