Mervyn, it is pleasing to know of another 280SEL driver. Are you located in the US? I have yet to see a 280SEL save the one I drive.
1976 300D (W115) - 330K and still going (sort of)
1991 300D 2.5 Turbo - Sold at 221K
1983 280SEL - Sold at 206K
1981 300SD - Sold at 232K