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That's too much oil on the floor from a dirty underside.
1) take the car to a self serve spray wash and clean the engine top to bottom. Wear old cloths and get under there and spray it down after you soap it up from all three sides.
2) drive it, idle it and drive it.
3) park it overnite
4) then crawl under there and take a peak at our oil cooler (driver side rear of engine next to the filter) It has a gasket on it where it mounts to the block that's been known to leak, It's a half our job for a GM good mechanic
5) check your oil pan gasket, also some issues with leaks there. That's a big job ! Subframe has to come off the car to get the oil pan off.
Had them both done on my baby by a great GM mechanic. both under warranty .
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