year a four-cylinder BMW engine will return to the U.S. in turbocharged formed, first in the 2012 BMW X1 sDrive28i and eventually the 1 and 3-Series models and even the Z4 Roadster. However, overseas, BMW has been selling a number of four-cylinder engines for some time now, both in naturally aspirated and turbocharged forms, as well as in turbodiesel guise. Now, a new report claims that BMW plans to…