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I want the good Green! Does this stabilize the temp or is it supposed to be all over between 190-210?
If your overflow tank is filling up with coolant it could be the lower (180 degree) thermostat is bad.
I have the vq35 engine, or 3.5 like I like to call it. I think there is only one thermostat on here. The 3.0 have 2 thermostats if I'm not mistaken.