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Thread: Spark Plugs at 40k ?

  1. #16
    Registered Member

    Join Date
    Apr 2019
    LTR6IX-11 6509 is for 2016 mazda cx-9 2.5T according to advanced auto website and numerous others as well! I'll stick with NGK over any brand plug. As it is tried and true many times over!!

  2. #17
    Registered Member

    2016 CX-5 (white), 2019 CX-5(red), 2019 Miata (white)

    Join Date
    Apr 2015
    San Francisco
    Quote Originally Posted by roadrutz View Post
    You buy a car that depreciates at around $5,000 a year. You pay what, $1,500 a year for insurance? You spend $2,000 a year on gas. You probably spend hundreds more on car washes and parking and accessories and such. And you worry about paying the dealer $100 extra for service work once a year? Come on, guys, not every dealer is a crook, and the work he does is guaranteed.

    I'm not a shill for dealers, but I think this whole thing about going to indies is overrated.

  3. #18
    Registered Member 60_Driver's Avatar

    2016 CX-9 GT

    Join Date
    Dec 2017
    Southern NH
    Quote Originally Posted by mazdadude View Post
    We should be seeing a lot of the forum members 2016 CX-9 2.5 Turbo's needing plugs now, it will be interesting to see the visual condition of the plugs upon removal.

    So, I had my sparkplugs replaced yesterday at 40.4k mi. I*m glad I heeded the service schedule here. The ribs were badly cracked on one. My mechanic said they looked like 100k plugs & was very surprised they came out looking this bad this soon. He figured it might be related to the serious heat this engine produces. I*ll attempt to upload a picture.

    I bought the plugs through Werner Mazda*s online site for $22.24/each. My guy charged me $75 for the labor, so I was out a total of $164. Saved a bit over dealership prices.

    I*m struggling to upload pictures from my phone. Never felt like such an old man...
    Last edited by 60_Driver; 04-24-2019 at 08:24 PM. Reason: Can*t upload pictures

  4. #19
    Registered Member

    2016 Mazda Cx-9 Sport

    Join Date
    Jul 2018
    los angeles, California
    Changed my sparked plugs at 51k, it was a DIY, easy peazy to change. Save me some cash from stealership

  5. #20
    Registered Member

    2019 CX9 GT AWD Sonic Silver

    Join Date
    Mar 2019
    Chicago area
    Has anybody tried something like this? I"ve used it once a year on my cars for years.

  6. #21
    Registered Member

    CX-9 GT 2019

    Join Date
    Nov 2018
    For a non-boxer turbo 40k interval does not look like an issue at all...

    My '15 WRX has 60k interval for spark plugs. But its worth changing early. I stretched it to 60k and got ~2 mpg jump and better idle when I finally changed them.

  7. #22
    Registered Member

    Mazda CX-9 Grand Touring 2016

    Join Date
    Sep 2016
    Washington, the state
    The Red Line fuel system cleaner is good stuff if your engine needs it. The only way to know if it needs it is to spend the $12 and use a bottle. Can't hurt (except the $12) and might be a little help.

  8. #23
    Registered Member


    Join Date
    Mar 2019

    Spark Plugs at 40k

    after a long track day today, I figured out that my OEM sparkplugs were ready to be replaced.

    My question is, I was willing to replace them with HKS m45hl spark plugs

    so would I need to tune my car or its fine and will work perfectly?

  9. #24
    Registered Member

    Mazda CX-9 Signature

    Join Date
    May 2017
    Changed my plugs at 41k. They look pretty good to me to be changed so early. Very simple DIY only need to remove 4 bolts (one 10mm, three 8mm) to have enough room to remove the coils and get to the spark plugs. Next maintenance project will be the throttle body!
    Attached Images Attached Images

  10. #25
    Registered Member BRnPA's Avatar

    2018 CX-9 GT

    Join Date
    Sep 2019
    Philly Suburbs
    Can we get some pictures of this DIY and make it a sticky?

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