We used the burnt motor oil also, but included flour of sulfur. It worked great for our dogs, and even some strays we felt sorry for. We did not dip them, but used a rag, and applied it to the infected area. Never had a problem with the dogs getting sick. They were always well taken care of. The vet always commented on how healthy they were. But when the mange hit, from stray dogs, or whatever, we used the motor oil, and sulfur.
Wayne