no such thing as an M606... Now there is an OelMotor606....OM606....

If you wish to learn the ways of the 606 then read in the performance section or over at the super turbo diesel site about it because 606 tuners know its ways.

The OM606 block is not the same as the OM603 block. For starters the external portion of the block is smoother and with less gusseting than the 603. The 606 also has a partial windage tray in sump to negate any effects of the spinning lower assembly.