Thread: For Don Shilady

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Hi 34-40!

The data I saw got around that problem by starting the graph at 1977 but I thought it was amazing that the national average was 17 mpg then in the time of carburetors. Right after my B.S. I worked for a summer at Socony on synthesizing those malodorous ZDDP copounds and I always wondered about what was really happening on the metal surface. The new studies use more sophisticated methods and can actually analyze the elemental content of the coating and it does contain some iron as well as Zn, S and P so there is some sort of chemical reaction between ZDDP and iron surfaces. The new surface testing methods are possibly more sensitive than the old 4-ball test, but I saw enough data to believe the AMS-oil four ball tests.

Don Shillady
Retired Scientist/teen rodder