The most common thing I’ve seen to cause coolant to mix with oil on GM’s is a leaking intake gaskets, it might be worth looking at, a pressure test would help. Most GM guys tell me they aren’t very fond of Dex cool because it can break down and cause cooling system issues so they often replace it with regular green because it seems to hold up better. Here is a video that might help you with the pressure test.
- Home
- 2003 Chevy Malibu radiator drain plug stripped