It is just STP oil stabalizer.
http://www.stp.com/oil_stabil.html
They dont say on the web page how much zinc is in it, so I sent an email. That is when they told me it is about six times as much as oil used to have.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.