STP oil treatment (Stay Together Please) is still out there !!

My best friend when he turned 16 inherited his older brothers 66 SS396 Chevelle 4 speed. It was a very nice car but used ungodly amounts of oil. He just kept adding STP and the oil consumption slowed considerably. After a while he quit putting oil in just STP. When he would back it down hard it would blow out big fireballs from the exhaust. One night he let another guy drive it, he drove it underneath a semi trailer cutting the roof off. They ducked just in time. And that's the truth!
Wow what a story.