The l3 has the AMBAC inj. system, better economy and lots less smoke, the main shaft is also built stronger. Have owned both the l2 and the l3 through the years. If finances permit update to 1990 or newer R50. (new style hydraulics) I also owned a 1991 R50 and it would do anything a "l" could do plus more. Better grain sample ,easier adjustments, more capacity. In their day the "l's" were king, presently own a 1998 R52. Good luck, Mike