New Dixon Product The lubricant used in the differential of automobiles frequently leaks at the ends of the axle. Believing that a flake graphite lubricant properly prepared would overcome this trouble, the Joseph Dixon Crucible Company have been experimenting and after many trials and tests have produced Dixon’s No. 680. It is to be used only when Dixon’s No. 677 or No. 675 will not remain in the differential, without leaking, and it is not to be used in the transmission.