I agree with Larry
I have had good performance from the standard Bosch Plugs and NGK TR5 (resistor plugs). I think earlier model M103's used a non-resistor plug and later ones use a resistor plug.
I tried Bosch platinums in my Volvo once and it started idling rough after a short time. I replaced the platinums with standard plugs and it was fine again. Ever since then I have shunned platinum plugs.
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