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the toyota T+4 fluid is fine, since you already have it. you can also use Valvoline Max Life. I'm using it now in the race car for the last year and a half, and it is great.
also on the 02 sensor, what is the pinout on the harness for that? I know there are 2 black wires and a white wire on the o2 sensor side, what do they match up with on the engine harness side? My wires have been pulled loose unfortunately