Losi Ten-T Conversion

So after reading this whole forum, my question is what diff fluids are people liking the most for racing? I am going to run the Tekin 1900 combo with a Losi plastic 45 spur and probably start with a 15 tooth Mod 1 pinion. There are a few modifications to Mike's conversion and the spur gear to make this work. Let me know what you guys are thinking for diff oils. I was going to try 7-10-2 but I am not sure.