Quote Originally Posted by EclipseE16g
When you replaced the thermostats did you also bleed air from the coolant system? Sounds like you have air in your system. I might want to also replace the radiator cap too. Oil in your spark plugs might also indicated your valve cover gasket is bad, so oil is leaking from the head into the spark plug tunnel.
I ll second that because my brother had bad gaskets for the spark plug holes and he had a hell of alot of oil in there.