Well I'll add my own personal tale.
I bought a new 92 Caravan for the wife, Slick 50 was advertised alot so I tried it instead of my usual stp oil treatment. A few weeks into it she came home and said she hit something and soon after the oil light came on so she drove it home
I went out to look, popped the hood and NOTHING on the dipstick. I looked under and there wasn't any puddle so I broke out the tools, jacked it up and found a nickel sized hole in the bottom of the oil pan; there was no chance that there was any oil left in pan and just not registering on the stick.
I can't swear slick50 saved that engine or not but I do know my wife drove 20 some odd miles home that day. I patched the hole with JB Weld & a peice of sheet metal and we traded that Caravan in for an Astro 8 yrs/ 90,ooo miles later w/o a single major repair. (left bearing assy in 98 was about the biggest repair)
I'm sure the 3800 has much tighter specs than the Mitsu3.0 so I don't know how effective or harmfull slick50 would be, Bobtheoilguys say Not to use it and I haven't in years.