1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s
I may be confused but isn't this supposed to be a Euro model? If so it should have Bosch W7DCO plugs. W9DCO were for US with Catalytic converter. They should be non-resistor plugs. Not sure the EGR is stock for a Euro either. Check the EGv107 Sticky for a vacuum diagram.