Thanks for the replies. Is the 560 the most reliable engine of the bunch? Since this car is for my Mom I think she would appreciate reliability and fuel economy over raw power.

__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine