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Discussion Starter #1 (Edited)
Had an early 30K service done today because of the cold weather and a couple of unexplained CELs. Replaced the plugs even though they don't appear to have needed it:





Will keep these as spares. :)
 

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Discussion Starter #3
Yes, the guys who did the plug change were sure these could have lasted for quite a few more miles. I doubt this smart will get another plug change before it's replaced. :)
 

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The only engine code(cyl 3 misfire) I have had was during the first winter in 2011, FE is unchanged(around 45 mpg).
 

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Plugs still look fine and the color looks pretty good.

If anything a gap adjustment or check...
Other then that save em' for back ups!

Look into side gaping spark plugs, practice on these.

Improved idle, the "3D" burn people talk about, better power and improved fuel mileage.

Performed this modification on both my Smarts and very happy with the results.

Stay away from Iridium spark plugs...
 

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For older autos with a low energy ignition system, I would agree with not using Platinum/Iridium plugs. For all modern engines it's the only way to go! I use copper or silver electrode plugs in my older Benz gassers.
 
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