Diesel passenger cars have never been a big thing in the US. Thanks to relatively cheap gas and plenty of affordable cars, fuel-sipping diesel sedans just didn't interest us as much as they did ...

In 2016, BMW unveiled its 3.0-liter inline-six quad-turbo diesel engine. The story behind it isn't quite as important as where BMW got its brand name from, but the B57S (or B57D30S0, as it was ...