I have watched 3 or 4 videos where, in late June 1941, the Axis invaded the USSR.
In most cases, the Axis armour and air units ran out of oil by late August.
When this happened, the armour units could still move their full movenment allowance - creating deep pockets in the USSR.
However, these armoured units, even for those in good general supply, could not attack adjacent enemy units.
I would like to see such OOO units to be given at least a moderate OP movement penalty, and be allowed to attack - perhaps only once - with an attack penalty. Similary for OOO air units.
Could this be modded in the Editor?
That seems reasonable to me.
"The fruit of too much liberty is slavery", Cicero