Link to my deluxe DIY kit: https://mercedessource.com/store/ml320-deluxe-spark-plug-replacement-kit. Because of two plugs per cylinder, these M112 V6 engines will run for a long time with worn spark plugs. They won't throw a check engine light until they totally fail, but you will experience longer starts and reduced fuel economy when the gaps get excessive. Check these out!
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