Mercedes-Benz debuted the double overhead cam (DOHC) OM 606 diesel engine to replace its single overhead cam OM 603. The OM 606 design was based on the gasoline-powered six-cylinder M103 and M104 ...
The M30 proved to be a durable and reliable engine ... later introduce the improved M104. The M103’s reliability was due to its precision engineering. Mercedes-Benz relied on solid build ...