Union 76 is pretty good stuff.....however, with the exception of Clark (which I would not use even if it were free) I usually get the cheapest chit I can find...and that goes for all my cars.

98.5 SE Sport badgeless, MTX, KKM, SVT exhaust with resonator intact.
1985 Z51 Vette with many mods. Only used when the Tour appears to be outclassed.