View single post by Jensen Healey
 Posted: 11-04-2010 07:54 pm
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Jensen Healey

Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 983
Hi Phil, After further reading, I can't recommend trying to formulate your own brew. Oil engineers spend their careers doing this.

Since too much ZDDP can chemically attack metals, (more than .20%), and we don't know how much is in modern SM oils, (probably under .05%), there's no way to know how much to add. Moss Motors sells ZDDPlus FWIW.

Unless you are installing new or re-ground cams this is not a critical issue. Just use the GTX for Classic Cars or Valvoline VR1 at your next oil change. No worries.


Last edited on 11-04-2010 07:55 pm by Jensen Healey