Last weekend, I was driving my 92-Lumina 3.1L and suddenly lost heat. Seconds later, the temp gauge went up. I immediately shut it down and after a few minutes discovered the coolant is mixed with the oil.
I changed the oil 3 times to clean the engine and am ready to fix it. The problem is I'm not sure which gasket(s) to replace. I'm thinking intake, but I'm wondering if anyone can suggest how to diagnose which gasket failed. Thanks in advance!!!