[Spridgets] ZDDP

[Billy Zoom]

> Castrol GTX with bottle of STP?
STP still contains ZDDP, but they don't tell you how much. It used to be the
main ingredient, but now it's listed last instead of first. Presumably, STP
4cyl. in the red bottle would be better than the regular blue bottle because
it's main function isn't to raise viscosity. It's too bad we can't just buy
ZDDP.  I'll bet one quart would last a long time.
BZ