Heating Oil in Finding/Owning French Property Posted July 5, 2005 Heating oil is known as "Fioul" (pronounced fee-ool). Usually you just phone up the supplier and arrange for the delivery tanker to come the next day. Saturday deliveries are usually possible. You don't have to buy a full tank but it usually gets cheaper the more you buy. A good starting quantity at this time of year might be 400-500 litres which should last quite a while until you turn the heating on !Don't forget you need to turn your boiler off for about 4 hours after the tank has been filled to allow all the sediment to settle.