Not good. Most likely a head gasket. I would not run the car anymore. That thinned out oil can and will cause permanent mechanical engine damage.
When the heads are off inspect cyl walls for any gauling (because of the metal shavings). and inspect pistons. If all seems well. Re install with new gaskets.
If you dont feel like getting that involved or running the risk of there being any other damage. Sounds like a crate engine is the way to go.... :/
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