I haven't been able to find a definitive answer on this, I know early style m120 called for non resistor plugs but with the later coilpack ignition, can a non resistor plug damage the car? I know copper plugs are the only way to go , but I'm curious because I have read that non-resistor plugs cause damage to newer cars ignition systems. I have a set of Bosch F8DC4 in the garage, when I got the car I just threw some autozone coppers in there, and she runs fine. Anyone have an opinion or answer?
This has been discussed many, many times. Just stick with the factory spec of non resistor plugs. Bosch F8DC4's are available from several sources and usually run about a buck each.
Replaced autolites with the bosch non-resistors idle just as smooth, slight burble I am chasing. Feel a bit more torque down low, maybe it's in my head
if you will take time, let's say 20 hours or so, you will find many discussions on internet. i did it. at the end it is clear to me that resistor plug cannot make any damage to ignition electronic components in comparison to non-resistor plug. so if resistor plug is dangerous for ignition, then this is true also for a non-resistor one.
I had resistor plugs (Bosch FR8KTC) installed by MB dealer when I bought my W140 last year. Replaced them with non-resistor plugs (F8DC4) but to be honest I feel no difference in performance.
I believe that spark plugs and oil are both somewhat like "snake-oil" and are sold with a little bit of smoke and mirrors. Why spend $5 or $10 on a spark plug when the factory recommended plug is available on line for about $2?
Same with the oil. They came with Mobil One, and the new ones still do, so why try to improve "The best or nothing"?
How many of you put the mid-grade gas in your cars which only require unleaded and do not specify premium? If you do, the marketing worked and you are wasting 20 cents per gallon on the fuel (in my opinion):nerd.
when you are "desperate" (i.e., searching for smooth idle) then you try many things . one of those wonders in the market actually works in my case: Lucas transmission fix. No more leaks.
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