The invention relates to additives for improving cold-flow and lubricating properties of fuel oils, comprising. The charge pump is switched to transfer charge from an input node to the capacitor and from the capacitor to an output node. Furthermore, a vectorial rotation of the integrated actual values by a yaw signal. The golf club also includes level indicators, in the form of spirit levels, mounted on the head to permit a user to determine when the head is in a desired horizontal orientation when addressing a ball with the golf club.