Germany has a lot of coal, so no need to import. That's why it was German chemists who invented both the first chemical process to convert coal to usable liquid gasoline, and to convert CO gas (state of matter) to liquid gasoline:

https://en.wikipedia.org/wiki/Bergius_process

https://en.wikipedia.org/wiki/Fischer%E2%80%93Tropsch_proces...

https://en.wikipedia.org/wiki/Coal_liquefaction

https://en.wikipedia.org/wiki/Synthetic_fuel#History

https://en.wikipedia.org/wiki/Oil_campaign_of_World_War_II

https://en.wikipedia.org/wiki/Gas_to_liquids

Also the reason why France occupied that region of Germany after World War 1, and then hilariously also again after World War 2:

https://en.wikipedia.org/wiki/Saarland

https://en.wikipedia.org/wiki/Territory_of_the_Saar_Basin

https://en.wikipedia.org/wiki/1935_Saar_status_referendum

https://en.wikipedia.org/wiki/Saar_Protectorate

Fair – I suppose my point is that they've set themselves up for an out better than others have.