Delivery of oil products to filling stations is carefully planned and checked by the Logistics Department. Supervision of compliance with unloading rules is provided by own dispatcher services. Metrological Services routinely check the amount of oil product filled into a tank truck at unloading bases. Arrangements have been made to control tank truck movement along a transportation route. Such a control organization system gives confidence that the fuel quality will remain constant during the "journey" of oil products from the manufacturer to the end user.