Two Sedans with some similarities, but otherwise different in most aspects such as the powertrain, horsepower, fuel economy, ground shadow size, model year, and height. First of all, there is a difference in model years. The is 2 years newer. Also, the 2014 MKS has a more powerful engine than the 2016 3 Series Sedan Diesel, and it gets 13.5 fewer miles on a gallon of fuel. In addition, the 3 Series Sedan Diesel body is significantly smaller than the MKS, and in addition to that, it's also slightly shorter. Among similarities are the body structure, market segment, starting price, and maximum occupancy.