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  1. NGK Ruthenium HX spark plugs available for the 3.6 H6

    Problems & Maintenance
    NGK Ruthenium HX Spark Plug Part Number LFR6BHX for the Subaru 3.6 H6 https://ngksparkplugs.com/en/products/ignition-parts/spark-plugs/ruthenium-spark-plugs It doesn't seem to be available yet for the 2.5 or 2.4
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