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I tried Castrol 20-50 syntec, didn't like it, really thin and I had problems keeping oil pressure. I went to the track shop, 7's Only at Buttonwillow, and they only had Redline Race Oil in 50wt. I've been really happy with my pressures with the Redline Race Oil (12psi idle and ~50psi at rpm). I change it out every other race weekend. I've ordered it from Jeg's by the gallon, but since you're in the Bay-Area Redline is local stuff for you. For Transmission oil I'm using Redline's MTL it's a little thicker than the D-4 ATF, ZF transmission's recommend ATF fluids stock. In the Diff I'm using GL-5 fortified 75-90 Redline gear oil.
Brake fluid, I'm happy with the Ate-Blue, it's held up really well, I just finished up my 4th race weekend without a bleed, but I'm in the high-desert so humidity isn't a problem like in the Midwest or East.
Be sure to used distilled water, with what ever you decided to use. Pure water will transfer heat better than any anti-freeze mix. The water-wetter is there to lube the water pump seals. Since I needed a new belt and one new rediator hose, I changed out the rest of the hoses too. Being in the Bay-Area you won't need to go through the motions of switching to Anti-Freeze over the winter, unless there's one of those rare cold snaps, just keep the race car in the garage and it should be fine. Hope to see you down here in the Southland some time B)
James
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