Can we make 100 on this thread? As for your ? about how hot, when the car is running, temps shouldn't exceed 250 degrees F. If they do, your oil will start to coke. Synthetics are a little better here, but exceeding 250 is not good. The problem is what are the temps when the engine is shut down and there's no oil/water cooling flow through the motor. I don't think you'd want to have your intake melt into the heads. GM has been using plastic intakes on their 3.8 motors for almost 10 years now. Anyone know what it's made out of?
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