All additives are junk. If you don't believe me read about it at the FTC's website.

http://www.ftc.gov/opa/2001/02/zmax1.shtm

According to the FTC, the CRC L38 test is a standard auto industry tool to measure the bearing corrosion protection properties of motor oils. 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.

The FTC's complaint alleges that the defendants did not possess and rely on reasonable substantiation for the following claims in the infomercial, on the Web site and in brochures that zMax:

increases gas mileage;

increases gas mileage by a minimum of 10%

reduces engine wear;

reduces or eliminates engine wear at startup;

reduces engine corrosion;

extends engine life; and

reduces emissions

The agency's complaint also alleges that the defendants falsely represent that the results of the CRC L38 test proved that zMax:

increases gas mileage;

reduces engine wear;

extends engine life;

lowers fuel consumption by 8.5%

lowers wear on valve stems by 66%

lowers wear on piston skirts by 60%; and

cuts carbon build-up on valve stems by 66%.

" 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. "

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