Lucas Hub Oil was formulated to stop leaks in steering axles and trailer hubs on heavy duty trucks. It also allows hubs to run on a marginal amount of oil in case of a blown seal or poor maintenance. It is an excellent gear lube for racing or heavy duty applications.
Excellent product - I put it in the main gear box for my 5' tiller and it has not leaked a drop. The price was reasonable also, and I received it shortly after I placed the order.