Definitive oil - any help?

[Bromley]

Just trying to get my head around oil, aside from the fact that there just doesn't seem enough for even basic play. I.e. I'm out of it despite operating and not building any armour (instead building 7 fuel-and-manpower efficient motorised corps), with only 1 new fighter and 1 new tac. My navy's been active in the South Atlantic though, so that's not helped.

Anyway, can someone clear the following up for me please. The manual says:

1. "Each country has a base Oil Production Value." Presumably it means just the majors (i.e. for the Axis Germany & Italy but not Romania, Finland etc. [EDIT - confirmed]). Any ideas what these are?

2. "Three Oil Points for every Prodcution Point generated at an oil field." So that's 15 for Ploesti.

3. "A countries Inductrial Capacity modifies this Oil Production up or down." Is the German IC used to modify Ploesti [EDIT - Yes], or is that Romanian and therefore not modded? Anyone know what the effect of IC increases is?

Final question is about the Economy Statistics page. It says Oil 28 (+39), which is odd as I've not moved/attacked/bought anything and ended last turn with zero oil reserves. So either something takes oil just to maintain or that 39 is not the oil increase I receive every turn (in which case, what is it) [EDIT - Pretty certain that this is going on defensive actions - good way for the Wallies/Soviets to paralyse the Axis].

Thanks for any help.

EDIT: Oil problems sorted:
(1) Don't ground attack with fighters, unless it's to take Paris a turn early.
(2) Do go for the Iraqi oil field
After my motorised corps were paralysed in the Russian winter, I noticed that the manpower requirement for 1 armour and 2 corps is the same as for three motorised corps. Likewise the same oil requirement, but it's easier to operate a single armour than three motorised corps.