Used both in my 1987 Nissan Maxima, in addition to Mobil 1 oil, and, one time, in around 1998 or 1999, Valvoline Instant Oil Change forgot to re-install the oil drain plug. I was about 18 or 19 years old at the time, didn't know much about engines, and I wondered why it was making such racket on the way home (about a 2-mile drive). Got home, decided to take it up to Firestone (again, about a 2-mile drive). Got back home, they called a short time later and said, "Mr. Pifer, that car didn't have any oil in it. We put oil in it, started it up, and it quit making any noise."
Now, if I'd known then, what I know now, I probably would have demanded some sort of guarantee or commitment from Valvoline to buy me an engine if it ended up locking up. Being a dumb kid, I didn't pursue the matter.
Did the Slick 50 and Prolong treatments keep it from locking up during that 4 miles? Maybe. I'd bought the car in 1997 or 1998 with around 52,000 miles on the clock. So it probably had 65-70,000 or more when this happened. And it continued to run just fine after this incident until I sold it around 2000.