I am puzzled by the expected behavior now.
From the manual:
Oil Maintenance – All units require oil to keep them in. If no oil is available for an oil unit, the units do not get the base recovery for effectiveness but do get the supply level and headquarters effectiveness recovery. For land, air, and naval units in port, 1 oil stockpile of maintenance is used for every 10 units/naval groups on the map. For naval units not in port the naval group’s oil use factor is used keep them at sea. Keeping naval units at sea is very expensive. Units on a map supply level 9 do not use oil as they get supplies directly from the train. Oil maintenance reflects trucks driving supplies to the units from the rail.
Oil Use In Combat – Oil dependent units also use oil to attack and defend. Land and air units will use their oil use factor every time they attack in a turn. They will use it once if they move. Naval units are not subject to combat oil use as this is already factored into their maintenance. Defending air superiority groups have a 50% chance not to use oil when defending over friendly territory.
Oil Use – How much oil a unit uses to move and attack. An oil-dependent unit uses oil only once for movement no matter how many times it stops to attack. Land and air units use oil each time they attacks. Naval units use oil each turn if they are away from a port, no matter their action.
Does it mean now that?
For
land and
air units, if there is no more oil stockpile:
1. I expect no more attack will be possible
2. There is 50% chance that air superiority groups will defend over friendly territory per the above manual rule in
blue.
3. I expect no move will be allowed anymore
4. But if the unit is located on rail, it is still possible to perform a rail transfer to another location
For
naval units, if there is no more oil stockpile and
the unit is in port:
1. I expect no move will be allowed anymore?
2. Or, do we allow naval unit to move at sea?
3. I expect the naval unit is still allowed to fight per the above manual rule in
green.
For
naval units, if there is no more oil stockpile and
the unit is at sea:
1. What is the consequence? Do we consider that the unit has enough in its hull to return to port?
2. Are we destroying the naval unit because the crew scuttles the oil-free unit to prevent the enemy from taking it?
3. I expect the naval unit is still allowed to fight per the above manual rule in
green.
Thanks