Oil math doesn't make sense

Maybe it's because the major cities all have a negative oil production (i.e. the oil consumed by the population)?
Just guessing, it's been a while since I last played.

IC needs oil in CORE. It´s not listed in your consumption overview.

Well some of it is indeed used by IC but i think more used by Public transports, heating, electrical plants and so on. Also for germany it uses the oil to make rubber and energy to make oil.

At the start of CORE you get few events. READ them for more info ^^.

resource planning: get as much as you can=trade for it early on

Well for resource planning depends on your game style. But a Few tips.

1. Germany has an Venetzuelan run oil trade boost it up (convoy run by vene so they dont get sunk ^^)
2. Build synt rubber plants about 25 or so will be ennuf for start. BUT do note that the build time for them is very long. so start building then as soon as you can. (need 37 heavy indust)
3. metal and rares. You need bit of metal untill you takeover france and gain metz. But afther that there not much that you need from others. And rares youll get from synt plants. Pre war about 20-30k metal and about 10k-20k rares will do depending on you build of rare plants.



some less not so sporty tips.
I. Build IC in high recource provinces and totaly ignore the -provinces (ie. Berlin) as IC boosts effiancy it therefore boosts the recources you gain.

Oh and incase you did not notice you can only build them from production menu not province menu.
Also the Synt oil i generaly do build some 15-25 about but generaly they are not producing oil as i import from vene the oil i need.

Leader traits are same as in Hoi 2.

Here's a link to the info: http://www.paradoxian.org/hoi2wiki/index.php/Leader_Traits

Edit there are few more than in Hoi 2 full info in Aod Manual page 53 for Army, 70 for Naval, 79 for Air.

Also the bonus per trait may differ like being only 5% instead of 10%.