Currently some of the most widely used diesel aviation engines, the Thielert/Technify/Continental 1.7/2.0 liter one, as well as the Austro E4, are both based on

Currently some of the most widely used diesel aviation engines, the Thielert/Technify/Continental 1.7/2.0 liter one, as well as the Austro E4, are both based on a Mercedes car engine.