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Discussion Starter #1
Not too many parts stores carry the Denso XU22HDR9 spark plug here in southern California. Does anyone know a compatible plug in a Champion or Bosch?
 

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The Bosch YR7MPP33 works very well in the 451 smart (I have used them for over 12k in my car). It is an OE type Bosch plug that is common to several Mercedes models including the 06-07 C280 with the 3.0V6 engine. I ran the equivalent NGK also but feel the Bosch makes the car run better. FYI - only Bosch, Denso and NGK make plugs that fit these cars.
 

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Discussion Starter #3 (Edited)
Thanks for the info

MPrice2984:

I thank you for the information. As soon as it stops raining here in "Sunny" California, I'll change the oil and plugs in my wife's "Giggle Box" (her name for her Smart Car).

David Barrett
 
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