There's a slight difference between kerosene [petrole] and 6 cst heating oil [fouil or mazout] here. For the burner, the problem is kero's poor lube qualities in the pump, so long-term it's not good but it will work. For a car, same problem. I have a full 1500 liter tank of diesel for the burner, but it's not road-duty paid stuff and it's dyed red. Big, big, fines if you get caught with 'red' in your car, strike or not and the 'bloaters' [gendarmes] can detect 1 part in 50,000! I have a nearly full tank of gazoil in the car and an emergency supply stashed in the tractor, so no immediate problem. I'm using my new electric bike to go to the farm for eggs and milk. 15mph - Zooooooom!!
As to bacteria, yes they can be a problem [or a boon, as in the Gulf off Louisiana], choking the filters. But they can't grow if there is no water in the fuel, so I try to take care to make sure its 'dry'.
