Additives

[JFP in PA]

Originally Posted by Spinnaker

If everything that I have read and if I understand it correctly, Z-Max works by introducing zinc compounds into the oil. These are anti-wear additives. The oil companies reduced these compounds in their oils because they can ruin catalytic converters if they coat the platinum mesh in the converters.
So the choice is to help protect the engine and risk ruining the expensive catalytic converters, or use a high quality oil and change it regularly.
If you live somewhere that doesn't have emissions testing requirements, this may not concern you.

Zmax oil additive does not contain any ZDDP, or much else for that matter; most analysis says it is refined mineral oil with a coloring dye in it. The product is also the subject of an FTC investigation concerning the validity of its advertising claims.

[Spinnaker]

Originally Posted by JFP in PA

Zmax oil additive does not contain any ZDDP, or much else for that matter; most analysis says it is refined mineral oil with a coloring dye in it. The product is also the subject of an FTC investigation concerning the validity of its advertising claims.

Upon further research, I stand corrected. JFP is right.