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  1. #1
    Member
    Join Date
    Aug 2012
    Location
    Winnipeg Manitoba Canada
    Posts
    87

    Iridium spark plugs

    Why can you run iridium plugs 100000 miles in a car engine but they need to be changed at 100 hours or once a year on a Mercury outboard engine?

  2. Member
    Join Date
    Mar 2012
    Location
    Pelham, GA
    Posts
    2,008
    #2
    Because you are burning oil in the combustion chamber which fowls the plugs, Plus outboards spend a majority of their time above 3500 rpms and vehicles don’t. Plus, when a car motor stops running well you pull into a gas station or service center, not an option 60 miles offshore, so a need for a larger safety margin.
    Mercury 2002 200hp Carbed Saltwater
    OT566776
    2002 Cape Horn 22' Bay

  3. Member
    Join Date
    Jun 2013
    Location
    LONGVIEW TEXAS
    Posts
    14,017
    #3
    MARINE aplication
    .................................................. ...the scariest thing in life is the unknown ...................................