Bombers used to be the only reason to get oil in vanilla. Tanks, battleships, and fighters were not useful. Once we acquired stealth bombers, oil lost its importance entirely for vanilla. It was only valuable for that narrow window of opportunity between the Bomber and Stealth Bomber technologies.
Vem made oil
much more important for any advanced land or sea warfare in the Industrial and Modern eras. I strongly buffed tanks to 5

and 2 sight range (was 4, 1) and nerfed Mechanized Infantry to 3

(was 4). Battleships are more powerful with +50% vs cities, higher base strength, and 6

movement (was 4). Modern armor, nuclear subs, and rocket artillery now require oil (unlike before).
Unlike vanilla, in vem each player's territory always has exactly 3 oil and 4 aluminum, as described in
how players/resources get placed. Deposits are also 50% more numerous than vanilla. This makes it nearly impossible to lack a strategic resource.
These use resources:
Oil
- Tanks
- Modern Armor (was aluminum)
- Rocket Artillery (was aluminum)
- Battleships
- Missile Cruisers
- Nuclear Submarines (was uranium)
Aluminum
- Fighters (was oil)
- Bombers (was oil)
- Jet Fighters
- Stealth Bombers
- Spaceship Factory
None
- Hydro Plant (was aluminum)
- Helicopters (was aluminum)