The Mercedes-AMG GT3 of SunEnergy1 Racing takes on the IMSA 12h of Sebring! #beastofthegreenhell #Sebring12h #imsaweathertechsportscarchampionship #imsa #mercedesamg #MercedesAMGMotorsport #sebringinternationalraceway #cars #carsofinstagram #SunEnergy1Racing