The range spans the M104 inline-six (300SL/SL320), the M119 V8 through 1998, the M113 V8 from 1999, and the M120 V12 in the 600SL. Commenters flag 1999 as the M119-to-M113 switch, note the 1997 SL320's unique M104/722.6 five-speed-auto pairing, and praise the naturally aspirated V12's relative simplicity versus later twin-turbo S600s.
Engine family across the range: M104 six, M119/M113 V8, M120 V12
Mercedes-Benz SL (R129) · mechanical