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Platinum or Iridium? Spark Plugs

SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

Platinum or Iridium? Spark Plugs

Old 04-18-2019, 02:26 PM
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2004 SL500
Platinum or Iridium? Spark Plugs

I believe the stock plugs are platinum, but equivalent iridium plugs are available. Any preference?
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