Here's the story of perhaps the most legendary diesel engine ever made, the Cummins 5.9L.

BMW began production of a quad-turbo diesel engine in 2016. Unfortunately, it ended production due to complicated engineering and its massive cost.

The above figures were observed while cruising near sea level with ambient temperatures of 75-80 degrees F. Final axle ratio was 2.78:1, with a turbo A/R ratio of. 81:1. With over 180,000 miles on the ...