Like Bob says, I would go by the SM rating. It might still have some but at a
lower concentration. Not high enough for proper camshaft protection over your
regular interval. Reading some of the tech specs on ZDDP, it appears that it
is a sacrificial additive that depletes as its called into use. Lowering the
concentration lessens the interval between needed oil changes. As you might
expect, increasing the concentration increases the interval. Haven't seen a
correlation to percentage and mileage yet though.
Shawn J. Loseke
Fort Collins, CO
http://www.triumphowners.com/79 (1972 TR6)
http://www.triumphowners.com/690 (1978 TR8)
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