I've got a 91 camaro Z28 with Dex cool antifreeze. I previously posted a message about a using dex cool. Anyway, I looking at the intake manifold where it bolted down to the heads. I see that there is some orange type sludge and orange crystalization around the intake manifold. Is it supposed to do that? If not, does this mean I have a leak? Should switch back to the green antifreeze? I hope to hear from any of you in respect to this topic. Thank you

 

The DexCool is fine. In fact I like it better than the regular stuff. If it is your original intake gasket, you may need to replace it. If it's a new gasket, you may need to torque the intake down a bit more.