About those "driptroits" ...
In their defense ... on our way home from the Kansas City All Truck Nats/Stovebolt Reunion one year in the '72 9500 with the 6-71, when we stopped at White's Truck Stop in Racine, VA near the end of the trip, the engine had burned less than a quart all the way from KC. with just Dello 15W-40. I think the more you run them and take care of them, the less they leak. Of course, after about a month or so of being back home, she went back to putting a qt in the drip pan ....