I'm playing on an 1.05 community server and just tried to refuel an Olga with a Jerry Can (Olga tank is empty, radiator filled and charged battery installed).. I do not see any option to refuel the car with gasoline or motor oil. I walked around the whole car with the jerry can in hand and never got a refill option offered. I alredy tried to empty the cherry can and to refill it at a gas station (which did work) and the to refuel the car, but still no success.