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Q:

oil in cooling system on 2004 Chevrolet Impala

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
oil in cooling system-low tire pressure stays on
(1) Answer
Looks like the oil cooler failed internally and let the oil sweep to the cooling system.
In this case you need to replace the oil cooler and flush out the cooling system - sometimes 2 or 3 times to get rid of the oil.

Zee