I use Protech Speed greese on pinion/bevel gears and oils inside.Oil can completely change handling of the truck. After trial/error i ended up with 7k in front and 10k in rear.
Radek
V4 D8 - RX8, XERUN 4168SD
F1-09 - Tekin RS Pro, 17.5t Redline, 2S LiPo
Sakura Zero S - LRP, Saturn 20T, 2S LiPo
*EX-10 Eurus*