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How often should they be changed in a '99 SLK? I can't seem to find it in the service manual.

And does anyone have a link where I can order them?

Thanks in advance,

Aaron
 

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For the plugs, per the mb guide I found it's 100k or 5 years for the 230. Personally I wouldn't wait that long. I only drive my '99 about 3k per year but I still pull and inspect the plugs every few years and change based on what they look like.

For the coils, at about $85 a pop, I agree that you wouldn't replace unless needed.

You may have already looked at but here's a good write up on how to change the plugs: http://www.benzworld.org/forums/r170-slk-class/1334720-spark-plug-removal_replace-slk230.html
 

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