Metal in the oil would definitely cause a problem. Hard to say where it came from, a part that was not machined right, part that failed because of poor metal, someone quit that day and tossed metal into a few engines as a "going away present". I would say the dealer is being honest. Sometimes you get a bad engine or transmission or whatever. Just a machine that is made by people.
As for "will it cause other problems", Not likely, the dealer will probably remove the engine, flush or replace the oil cooler if it has one, install a new engine and ship the original back to GM for failure analysis.
Then they will say "Oh we are very sorry this happened, please return to us to buy your next new car".
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Tuesday, January 3rd, 2017 AT 7:55 PM