@ Rendi Wardana:
At the FXDD broker I use, there is a 0.01 lot option for the WTI/USD pair (OILUSD). If you want 0.1 lot, then type it directly into the Volume column.
The same applies to InstaForex broker, it can be 0.01 lot and 0.1 lot for Crude Oil Futures (QMN21).
This is what I’ve been looking for all along, a broker that provides 0.01 lot for oil. Thank you Master @Martin for your help.