[rotorwrench]

With the racing oils, I think Mobil puts more zddp in there than is actually necessary for all but racing. Most all the figures I've seen on the subject put the nominal useful value at 1200 ppm per container for best anti wear results. Amounts above that actually start to get relatively acidic and can affect other materials in the engines. A person has to keep in mind that the stuff is made for racing with very hard use and constant oil changes and not for normal driving and setting for several months in the garage. I'm not saying a person shouldn't use it but be aware of what it's really for.