Hello everyone, I'm James and this is my 1st pontiac grand prix, or anything with a 3.8L V6. Car has 180,000 with no previous issues.

Long story short the car got very hot due to a bad thermostat (I think) and now I have water in my oil. Can anyone point me in the right direction for diagnosing if it's a hg or IG please? This is my old transportation and I need to get it back on the road pronto. Thanks in advance for your help.