In addition to the $10million Slick 50 had to pay following the FTC ruling, they (slick) settled a class action by agreeing to pay another $20Million for false advertizing and deceiving claims.
Other "Miracle-in-a-bottle" snake oil marketers fined by FTC include: (partial list)
Castrol Syntex Power System
Dura Lube Engine treatment
Motor-up
Prolong
Shell Vektron 3000
Valvoline TM8 Engine Treatment
ZMAX Power system
Split Fire spark Plugs.
STP.
JackD