I'm surprised you didn't get seriously flamed for asking this question. It's been discussed ad nauseum many times on these forums. For just about any application in an RX-7, including modded and ported engines, run a high quality dino oil in 10W-30 or 20W-50. The oil of choice seems to be Castrol GTX. I have run Havoiline in both my 7's, 10W30 in winter and 20W50 in summer, and both have lasted a long time. Change oil every 2500 to 3000 miles.
For the Xmission and rear end, run a high quality synthetic 70-90 like Neo, Redline or Royal Purple.
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