my mercedes manual mentions champion, bosch, and beru spark plugs. what does happen if you use a resistor plug if something bad were to happen? I need to get plugs too and the h9dc/h9dc0 are now hr9dc/hr9dc0. I know that I can easily call the dealer and they can get the plugs, but I'm tired of being raped in the pockets by them over charging. I try to go by what my manual goes by so I can keep regular maintenance work from becoming unnecessary eff corrections from mistakes or poor judgement.

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1990 190E 3.0L