380 SLC Coupe R107 09/1980 - 08/1981 M116.960. 450 SLC Coupe R107 09/1974 - 08/1979 M117.985. 500 SLC Coupe R107 03/1980 - 09/1981 M117.960. 380 SE, SEL W126 09/1983 - 08/1985 M116.961,963. This is probably because of modern fuel additives & the introduction of ethanol into fuel.
