All Bosch Platinums are resistor plugs, and the Bosch supers are NOT. MB stock wires have resistor plug connectors, so if you want to use platinum plugs you must either replace the wires with non-resistor wire (using the stock ends) OR replace the stock ends with non-resistor ends, using the stock resistor wire.
Under those conditions, they work very well. I put +4s in the 300TE on the advice of my MB mechanic, who only uses platinum plugs. No issues except rough idle, and that is dead engine mounts more than anything else.
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!