Did they say when you'll get an update? I'd be doing everything I could to get out of this deal and give the car back. If they replace the engine, it'll crush your resale value.
I had to trade-in a previous M6 to Carmax far below market value because I had to have an engine replaced, and they were the only ones that didn't catch it. And I traded it in the day after I picked it up from its engine replacement surgery...
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