German war options if Barbarossa never began

How might the European war change if Germany never launched Operation Barbarossa and continued buying Soviet oil?

Germany could fuel more operations in North Africa, the air, and at sea, while Britain would likely target the rail traffic carrying that oil.

The counterfactual removes Operation Barbarossa and assumes Germany continues purchasing Soviet oil. More fuel could then support the North African campaign, Luftwaffe sorties, and Kriegsmarine operations. The extra supply would allow more activity without eliminating Germany's logistical vulnerability. British heavy bombers might respond by giving the rail traffic carrying that oil a higher targeting priority.