Recently i use mugen seiki 1 million silicone oil for my M03 gear differential. I mixed it little bit , about 8 pct , with tamiya ceramic grease for gear contact longetivity reason. At first the differential action was tight as I expected. I am very pleased with it.

After the race I notice the differential action become loose and looser. I checked inside my car gear box is somewhat messier because the silicone diff oil most probably was leaking out during the race. I am not happy with this setup because the diff oil is somewhat leaking during operation.

I build a new set and I try to improve the gear diff ingridients this time with serpent putty cleaning gum mixed 10pct with silicone oil 450 from suspension oil. I take my time slowly putting the putty inside the diff. Finally, this time works awesomely...., the ingridients remain inside the gear diff unit. The diff action is still there even after 2 race meeting. One addtional tip, I also use longer screws : 2x10mm i guess , I want to make sure the diff cover will not split open during operation.