i am interested in this exchange. as i have a 1986 560sel with 247,000 miles.
over the last 5,000 miles it has become hard starting when warm after it has set for over 30m minutes.
runs fine when it is running. and idles ok. but always starts rough.
my mechanic thinks that it is OK but if i want it improved, the injectors need to be replaced.
i had thought that they had been replaced at 200,000 miles, but according to the service records, these are the original injectors. hmmmmmmmm.