Liquid BC oil appears to be jamming my Frame Quarry. Liquids are supposed to be destroyed when a Frame Machine moves to enter a block containing liquid. I *think* this may be as simple to fix as adding a block ID to the RP2 config for the server.
To my knowledge frames with actually hold liquids when moving (as you've probably seen) so maybe you can try and put some covers on your frames. If that doesn't work its probably cause BC oil is a mod item(?)
Without covers, the Frames will move the oil fine with the frames. The problem is that with covers, the oil blocks aren't destroyed as the frame machine moves to occupy that block, like they do with other liquids like water and lava.