Got my first off-road session with this center diff and 100k fluid. It performed VERY good, as expected. I'm running a GoolRC 4076 2000kv motor along with a Yeah Racing heat sink & twin fans (which make a huge difference), Castle MMX ESC, Turnigy Basher 6S 4000mah 65C hard case battery, and belted dBoots Backflip tires. These are my temps after a full pack.
Center diff, 14x
Motor, 13x
ESC, 15x
Battery, 12x
The last time I ran the Tekno center diff it was over 200 degrees. My Turnigy Graphene battery runs cooler but I don't typically run a soft case in this truggy.