The pak128.german started in 2000 with:
Coal mine - Scrapyard - Iron mine - Steelmill - Car factory
Refinery
Car dealer
Which one is missing? No Oilfield for the refinery to use the chain. I hoped that this chain will get complete in the nearest time of industry extension or creation. It happened after 12 years, but no Oilfield appeared. I saved and reloaded but observed that the game created many kinds of new chains (sometimes with a lot of factories), but even when it created a single Gasstation, it was connected with a refinery that still had no supplier.
Any chance for this Oilfield or not at all?
Seems me like a bug. My refineries every times get their suppliers. Or it´s not enough space in the target temperate zone/ temperate zone does not exist in your game.
Solution: Place the oilfield or -rig and connect it with the refinery with the editor.
You are right, and I also think it is the result of blind following players choices:
Map number 8655 (all zones present)
Map size 128x128
Number of factories: 7
And the automotive chain needs at least 8 factories.
If it is the bug - then only because no oil supplier appears when new chain is created. Lack of oilfield in the beginning was a result of chosen limits.