(1) central purchasing of parts and supplies;
(2) an effective inventory control system;
(3) a uniform work order and record-keeping system assigning actual maintenance cost of each pool vehicle; and
(4) preventive maintenance programs for all types of pool vehicles. All fuels, lubricants, parts and maintenance costs including those purchased from commercial vendors shall be itemized on a form provided by the Division and shall bear the license plate number of the pool vehicle serviced and the mileage on the odometer of the pool vehicle at the time of service.