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Thread: 40,000 Mile Spark Plug replacement on 2016 CX-9

  1. #1
    Registered Member

    2016 Mazda CX-9 GT

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    40,000 Mile Spark Plug replacement on 2016 CX-9

    Greetings All,

    I have been cruising on the forum for some time now and have my first question. I was reading in the manual for my 2016 CX-9 and noticed it says to replace spark plugs at 40,000. Sounds a little premature right? My other car states 100,000 miles. Also the spark plugs are like $22 https://parts.coxmazda.com/p/Mazda_2...PY8V18110.html

    Does anyone really think this is necessary to be completed at 40,000?

  2. #2
    BMW & Mazda Enthusiast GJ-Molestor's Avatar

    2011 BMW 528i & 2015 Mazda 6

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    Quote Originally Posted by morenar View Post
    Greetings All,

    I have been cruising on the forum for some time now and have my first question. I was reading in the manual for my 2016 CX-9 and noticed it says to replace spark plugs at 40,000. Sounds a little premature right? My other car states 100,000 miles. Also the spark plugs are like $22 https://parts.coxmazda.com/p/Mazda_2...PY8V18110.html

    Does anyone really think this is necessary to be completed at 40,000?
    if the owners manual says 40k miles, I would at least take them out and check to see if they are worn or not.

  3. #3
    Registered Member

    Mazda CX-9 Grand Touring 2016

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    Do we know if they are a commonly available plug we can buy almost anywhere, or if they are a special plug made by Denso or NGK for Mazda that we can only buy from a dealer?

  4. #4
    BMW & Mazda Enthusiast GJ-Molestor's Avatar

    2011 BMW 528i & 2015 Mazda 6

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    Quote Originally Posted by PTguy View Post
    Do we know if they are a commonly available plug we can buy almost anywhere, or if they are a special plug made by Denso or NGK for Mazda that we can only buy from a dealer?
    You should be able to buy them anywhere. I recommend NGK or Bosch

  5. #5
    Registered Member

    2017 CX-9 Signature

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    Quote Originally Posted by morenar View Post
    Greetings All,

    I have been cruising on the forum for some time now and have my first question. I was reading in the manual for my 2016 CX-9 and noticed it says to replace spark plugs at 40,000. Sounds a little premature right? My other car states 100,000 miles. Also the spark plugs are like $22 https://parts.coxmazda.com/p/Mazda_2...PY8V18110.html

    Does anyone really think this is necessary to be completed at 40,000?

    I plan to replace as needed all top side components of the ignition system, fuel delivery system and EVAP system once every few years. The type of driving done over that time period and the results of various diagnostic test results on those same components will determine what (if anything) gets repaired or replaced. If the test results come back good, but I notice visual wear and tear on certain parts, then I'll start replacing things. Should be able to do all of this without taking it to the dealer.

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