Agreed, as a general rule. But MB owners seem to make claims about having technical data/information, but never seem to be able to produce it. I’m only trying to ferret out answers. I prefer to not blindly follow what MB Engineering states. Remember, these same "brain children" brought us the ML, et.al., mid-90's wiring harnesses, said Techron as a gas additive (any gas additive) is very bad, then changed direction 180º, etc., etc. I simply want to know "why" resistor plugs are not recommended.
The glory days of Mercedes-Benz are in the rear-view mirror. In my opinion, up until the early 90’s, perhaps a little earlier, MB engineering was awesome. After that, quality of engineering and manufacture went down the toilet. We cannot always use yesterday’s thinking with today’s MB vehicles.
Dpetryk – Your post poses a good question, but the original sticky represented the view that resistor plugs are bad. This thinking has been prevalent amongst MB owners for years. I’m not completely against the concept of non-resistor plugs use only, but struggle with not knowing why. And no one seems to be able to produce data (other than subjective personal experience or “the manual says so”). Inquiring minds want to know.
Not sure. What does your MB Owner’s Manual say on the subject of synthetic oil use with resistor spark plugs? That's the standard response. Mine is vague on the subject.
Of all the posts, this is the one I’m really watching out for. Yes, I could have e-mail’d the Classic Center myself, but I fear I would get a much generalized answer. Perhaps you might receive a better response. If I had contact information for MB Engineers directly, I wouldn’t be futzing around here with a no-win thread entitled
Spark Plugs: Resistor vs. Non-Resistor. Regardless, I look forward to reading the reply from the Classic Center.
Not sure. Here is the official Bosch Spark Plug Designation Guide…
http://www.boschautoparts.com/NR/rdonlyres/C77B3446-232B-4AEC-AFA9-AD05F2A0A2AD/0/DesignationCodes.pdf
Sorry, can’t speak to the SF radio stations as I haven’t lived in the Bay Area for over 1-1/2 years.
Hmmm… Just out of curiosity, when was the last time the plug wires were changed? As a rule, as plug wires age they increase in resistance. I’m surprised the resistor plugs, by themselves, caused the small amount of soot.