TO my mind, there is no 100% guarantee that a Bosch part is as good as an MB-supplied part (that may also be Bosch). Different Quality Assurance standards may be applied when the batch goes to MB and, certainly, the MB-supplied part will have an MB reference number and the 'star' logo.

I imagine Bremi could win a contract to supply MB in which case they would have to apply MB QA standards.

My original rotor arm was Bosch/MB, as was the cap. What went wrong was that the resistor in the rotor arm (1 KOhms) broke down at high temperature and I had to wait for things to cool before it would start again.

And this resistor in the rotor arm is a key thing here as you do NOT want to add another resistance in series with the spark gap by installing resistor plugs. I have 12 high-priced plugs supplied by MB in France who swore these were right for my car. Only when I installed the correct non-resistor plugs did things start running right.

It might be interesting to short out the Bremi rotor arm and refit the resistor plugs. Any comments on that, anyone?

RayH