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California Dreamin
2006 SLK 280
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13,796 Posts
Discussion Starter · #1 ·
Any suggestions as to which is the better of the two plugs.

Per NKG one is high performance and one is Ultimate high performance

both show that they are compatible with the 280 SLK

They are both roughly the same price
 

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* Founding Member #2
2008 SLK55 AMG
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19,485 Posts
No brainer (for me): Ultimate High Performance, especially with minor price difference.

I did discuss iridium spark plugs with an independent MB technician in the remote past: his comment was that iridium plugs will make the engine run "hotter" and vehicle owner will notice perhaps some performance improvement in Japanese cars as they tend to run "cooler". He states MB vehicles tend to run "hotter" normally, ergo, the vehicle owner may not notice any performance difference.
 
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