This package does not include the rubber dampeners, but the "oil" you are referring to is the silicone inside of the rubber dampeners. If the dampeners start to leak, you will need to remove and replace them. Wipe the camera off right away. You can find the replacement dampeners at the link below.
https://www.vertigodrones.com/Yuneec-E90C23-Silicone-Rubber-Dampers-YUNE90101_p_2019.html