Sorry Peter, thought you owned the 560. "Peter, what year is the 560 SEL? I had a 75 450SEL that was a nightmare with cutoff problems. After too many episodes to count, including fuel filter, many sets of electronic ignition trigger points, injector cleaner, etc, etc. my techs advised that the distributor bushings were worn to the point that fumes were contaminating the points. This car would foul points in less than a week of driving, but would get better than 20 mpg for the first few days. If you have the same distributor, and you've already changed the fuel filter, I'd start with the distributor, in particular the resistance across the points. If you're getting good contact, and good spark (or if someone has already replaced the distributor), you might look toward the TSU, transistorized switch unit, if your car has one. The germanium transistor has a tendency to "faint" in hot weather, going open until it cools off a bit. I had this happen on two cars, a 1970 280S, and the 75 450SEL. The other potential cut-out problem with the 450SEL involved the Rube Goldberg method of "firing" the injectors. I vaguely recollect four additional sets of points, housed below the ignition points in the distributor, with a truckload of shorted wiring, whose job it was to open the injectors. Once I repaired all the shorts and opens there, the car would run great for a few days at a time, as long as it had new or cleaned ignition points. I hope your 560SEL has newer technology than all this. If not, you might consider a 300SDL. I have an 87 (yes the catalyst and the turbo were replaced) that I intend keeping til the wheels fall off. As a backup, I've also got the same engine in an 87 300D. Both cars are very powerful examples of the breed (148 HP), although the new diesel is even more powerful. "
Good Luck with the cutout problem Mike Boerner 87 300SDL, 126K 87 300D 131K 01 320ML 42K
