A great hydrogenated cooking oil with an excellant food coloring dye.
"In February/March 1997, an independent laboratory performed two CRC L38 tests of zMax for Speedway and Oil Chem. In those tests, motor oil treated with zMax produced more than twice as much bearing corrosion as motor oil alone. The complaint also states that the defendants fabricated one "report" from the two test reports, eliminating the bearing corrosion results and all other negative test results, and then used that report and the "official laboratory results" - similarly edited to remove detrimental data results - as sales tools in the infomercial and on the zMax Web site. "
"This case is the latest in a series of FTC law-enforcement initiatives targeting unsubstantiated claims made by auto additive manufacturers. The FTC previously halted allegedly deceptive advertising by the marketers of Dura Lube, Motor Up, Prolong, Valvoline, Slick 50, and STP, other major brands of engine treatment products."
http://www.ftc.gov/opa/2001/02/zmax1.shtm
"Oil-Chem and SMI have not admitted any liability in this litigation. However, in order to avoid the significant expense and time involved in the litigation, the FTC, Oil-Chem and SMI have agreed to end the litigation by the signing of an order, which, in summary, states: (a) Oil-Chem and SMI do not admit any liability and continue to deny any liability; (b) The FTC has issued its compliance letter (which confirms that enforcement is not merited for the eight specified claims); (c) Oil-Chem and SMI will not make advertising claims which are not properly substantiated; and (d) Oil-Chem and SMI will offer a refund of up to $1 million, in the aggregate, to certain purchasers of zMAX, who bought zMAX before January 31, 2001. "
http://www.carbibles.com/additives.html
The problem is engine oils contain their own additive packages and after market additives may actually react BADLY with oils and their additives.