Hopefully your no bubbles in the radiator test was legitimate. As in the radiator was completely full and the engine was fairly well warmed up when doing this test. This would mean that if you replaced your intake manifold gaskets you would probably fix your problem. I believe those engines still have an upper and lower intake, this means you are replaced the lower gaskets that set against the cylinder heads. Do a web search for ..2006 Pontiac Grand Prix 3800 water in oil.. you will get a lot of info. I am linking one of the results that came up in my search. I have used their info before and it seems fairly legitimate.
Editing to add: I overlooked the ..started using oil.. part of your post. The intake gaskets may or may not fix this issue. Did your oil actually change colors when you changed it? If so it may fix the oil use. Also if the oil changed color you are probably dangerously close to a rod bearing failure. Did you ever try to crack the drain plug after it has sat all night to see if water drips instead of oil?
Hope this edit does not screw up my margins and spacing, seems to be a common problem with the edit feature on an iPhone.
This post was edited by used red MN on 02/18/2023 at 12:38 pm.
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