I have been using the Valvoline Dura blend full synthetic 10w40 for the last 5 oil changes and I am pretty happy with it...
It might be a cheaper alternative for you than the VR1 oils
http://www.animegame.com/cars/Oil%20Tests.pdf
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
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