Lucas has a dislpay in the store that has 2 compartments, each with a series of plastic gears run by a hand crank. One compartment has straight motor oil, the other has Lucas fortified oil. When you crank the lucas setup, the oil clings to the gears and climbs up to the top gear much more readily than the straight oil set up.

I figure I don't need oil clinging to the crankshaft and other parts, I need it to easily shed from the rotating assembly and get back into the pan. So I don't use Lucas oil treatment in my race moter.