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1999 ML430 and 2003 C230KMT Sport Coupe
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Discussion Starter · #1 ·
I would like to replace the spark plugs in my 2003 C230K coupe with a plug that functions and operates within a heat range that is closest to what my car came with from the factory. Can any of you please be so kind to let me know which of the spark plugs listed below would be a good choice for what I am looking for and if none of them are, which plug would you recommend?

CHAMPION Part # 71 {COPPER PLUS #RC12YC}

CHAMPION Part # 3071 {PLATINUM POWER}

AUTOLITE Part # APP5325 {PLUGS Double Platinum}

CHAMPION Part # 7071 {DOUBLE PLATINUM POWER #RC12PYP}

AUTOLITE Part # XP5325 {Xtreme Performance Spark Plug}

CHAMPION Part # 9201 {CHAMPION IRIDIUM}

DENSO Part # 5304 {Iridium Power #IK20}

BOSCH Part # FR6MPP332 {OEPLUG}

NGK Part # 3588 {Premium Iridium Plug #ILFR6A}

Thank you,
Brandon
 

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2004 C230 Kompressor Sport Coupe
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1,903 Posts
Factory plugs should the Bosch FR6MPP332. I believe they are iridium or at least platinum as they are not called for before the 80k (or 100k?) service.
 

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2002 C32 AMG
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1,771 Posts
The iridium plugs only last about 60k miles, so the OEM Bosch is probably platinum. I decided to stick with NGK being that it's the OEM plug for M111, and upgraded to the NGK Iridium IX plugs. I did notice a small increase in performance after switching to the iridium, but my OEM NGK's had 95k miles on them...
 
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