[W126 Coupe] Denso Iridium Spark Plugs and the SEC

[airedale at sbcglobal.net]

Mine fires up smoothly every time. When I replace my plugs I will replace 
them with exactly what MB specified. There is no magic bullet.
----- Original Message ----- 
From: "a figment of the imagination" <figstir at yahoo.com>
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Sent: Thursday, September 08, 2005 12:41 AM
Subject: Re: [W126 Coupe] Denso Iridium Spark Plugs and the SEC


> Hi all!
>
> Okay, here's a question for debate that has been going
> on for some time on all the Benz forums.
>
> What is the premium spark plug for the SEC?
>
> Today, I just completed a tune-up job for my 380 SEC.
> As part of the many normal things one would do during
> a simple tune-up, I replaced my Bosch Platinum-2's
> with Denso Iridium plugs, instead of the Bosch Supers
> (W9DC's..).  Instead of going back down, I went up...
>
> I know Gary (from Canada) uses Iridium's on his 560
> SEC.  So far, I am not aware of any complaints.
>
> The one improvement I noticed right away was that the
> misfiring I had after the huge downpour went away, but
> I think the reason this was fixed had to do with
> replacing my most likely worn-out or damaged dizzy cap
> and rotor.   Nevertheless, with these Iridium plugs
> the car just fired up so quietly and smoothly.  It was
> an impressive change.  I haven't driven it yet, and am
> waiting for a response.  In general, with the more
> efficient spark, I expect to gain improved performance
> and better fuel economy.
>
> However, my concern here comes after reading about so
> many others who warn of not using anything different
> than the Bosch Supers.  I truly do not understand the
> dangers of using Platinums, Platinum 4's, or Iridiums.
>   I also have not seen any *new* original literature
> from Bosch or MBZ that warns against these *newer*
> plugs.
>
> 1) Are these truly justified contra-indications?
>
> 2) What is my biggest risk in using these Denso
> Iridium plugs?  Do I need to take them off right away
> before I supposedly destroy my engine, an argument for
> which I have not seen one solid basis for as of yet.
> Please advise.
>
> Thank ya!
>
> -figstir
>
>
>
>
>
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