kirban 2 cents worth
Its the proper amount of concentration of zddp to treat your engine using the current conventional or snythtic oil you have always used. Issue is new oils (SM starburst symbol) now only have between 600-800 ppm of zddp when your car was new it had 1,800 ppm.
The 4 ounce bottle of zddplus brings the current oil in a 4-6 quat oil change back to those specs....nothing else is in the bottle.
it is available from major turbo buick vendors
sold also by isky-crower-erson cams
and several major engine warehouses...
denniskirban@yahoo.com
PS On a side note I see you reside in Washington State we also sell to Delta Cam which is in Washington you may have heard of them. But best bet is any of the major Turbo Buick vendors can also supply it. I only mention the outside sources to show more credibility with the product. The person behind it owns over 100 turbo Buicks.