You lost a GALLON of coolant ? That's ridiculous. I cant believe the Dealership let you drive the car off the lot. Do you see any white smoke coming from exhaust on start up ? That's a sign of a blown head gasket.
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2020 M550 / Dark Graphite / Napa Saddle Brown / DHP Pkg / Exec Pkg / Luxury Pkg / Parking Asst Pkg
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