As automakers were switching en masse from carbureted to fuel-injected engines during the early to mid-1980s, and the detergent additives that existed in most available gasolines proved not to be enough to prevent injection clogging, leading to drivability problems, Mobil received accolades from General Motors and other automakers for increasing the detergency of its Super Unleaded gasoline in 1984 to prevent formation or deposit build-ups of the injectors but also remove existing deposits as well in normal driving. At the end of the 1980s Mobil sold its fuel stations in Norway, Sweden, and Denmark to Norsk Hydro, who converted them into Hydro stations.