I do not remember the term MB uses. The 96 C280 we own uses the Bosch
Super copper (factory plug). I tried to upgrade to Bosch platinum but
the engine misfired a lot. It turns out that its ignition design
includes the plug resistance. Each coil fires TWO plugs (in sequence).
IIRC, this design is only used in 2-3 years around 95-96, for 2.8
and 3.2 liter M104 engines. We now stick to factory plug. And Tiger is
right: we change the plugs every 30k miles in average (or misfiring will
start).
The 300SE should be M103 engine. I am not aware it ever uses such
design as the C280. However, I would still recommend factory plug.
Dr_Chino wrote:
> On 18 mar, 18:13, "Tiger" <tiger0...@[EMAIL PROTECTED]
> wrote:
>
>>Iridium is good... they last alot longer. Please remember factory plugs
>>should last 100.000 miles. These plugs are not copper.
>>
>>Platinum single electrode is okay substitute. I don't recommends putting
>>anything other than factory plugs.
>>
>>If the factory plugs comes with two electrodes, then you can put two
>>electrodes in or equivalent single electrode oif the same grade... do
not
>>downgrade.
>>
>>I don't remember what year MB start to use these long lasting plugs...
>>whatever it is, these plugs are not every year tuneup parts. Even copper
>>plugs on older cars can last 2 or 3 years without a problem. I would say
>>roughly 30,000 miles.
>
>
> Thanks Tiger
> part of my problem was my car (w140 1993 300SE) wasnt original plugs,
> local MB dealer (list) uses Bosch F8 !! copper electrode, so it sucks
> i ask for Bosch platinum even for im****t, they cant do it for me.
> thats why i choose on Champion from a good friend that owns a MB.
> i have read about Itrium but not about iridium spark plugs on street
> cars.
>
> now i note a difference, works better, but i still think im not using
> "the best" sparkplug
>
> when your local dealer have wrong info youre lost!!!
>
> best regards
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