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Thread: Replace spark plugs?

  1. #1
    Registered Member

    2010 Mazda 5

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    Mar 2011
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    Replace spark plugs?

    The maintenance schedule says to replace the spark plugs at 75k miles. I am at 78; and being better gas mileage than ever. 23.9 in around town driving. I don't want to mess this up. Should I just leave it alone till there is an issue?
    2018 CX-9 Grand Touring
    2010 Mazda5 Sport Manual
    2005 Ford Freestyle Limited AWD
    2000 Ford Excursion Limited 4WD 7.3 PSD
    1991 Miata

  2. #2
    Registered Member

    2012 Mazda5 Sport AT

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    I follow the recommended schedule. It's a super easy job. It'll take you under 30 minutes total.
    Completed mods: 15% tint all around | Class I trailer hitch | JKS Rear Spoiler | OEM bumper guard | OEM roof rack | Thule 872XT fairing | Hella Supertone Horns



  3. #3
    Booga Booga? phunky.buddha's Avatar

    2009 Mazda5 Sport

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    Preventative maintenance > reactive maintenance. Easy and cheap, take care of it.

  4. #4
    Banned GJ-Molestor's Avatar

    2011 BMW 528i, 2015 Mazda 6, 1995 Nissan Maxima Manual

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    Change them. Check air filter while you’re under there. There’s no way fuel economy won’t improve with new spark plugs.

  5. #5
    Registered Member MZ5black's Avatar

    2014 Mazda5 Sport Auto

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    I changed iridium spark plugs on another vehicle at 98k miles. Took out Denso and put in NGK iridiums. No change in fuel economy, performance etc but at the same time there were no issues prior to change. It's really up to you to change them. You should know your engine's condition best. In my case on the other car, I probably could have let it go for another 10-20k miles.

  6. #6
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    2012 Mazda 5

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    I have 92k on my 2012 and have a set of NGK 90083 coming tomorrow. Probably swap them out this weekend.

  7. #7
    2012 CR Mazda5 Touring 90210's Avatar

    2012 Mazda5 Touring

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    Quote Originally Posted by dougsey View Post
    I have 92k on my 2012 and have a set of NGK 90083 coming tomorrow. Probably swap them out this weekend.
    Just have 91,700 this weekend on my 2012 (owned since new)

    Still oem original spark plugs

  8. #8
    Registered Member

    2012 Mazda 5

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    Changed out the plugs today, super easy job taking no more that 30 minutes. Just like Orangutan said above. It's very helpful if you have a 5/8 spark plug socket with the rubber insert to hold the plug while you lower it into the hole.

    Original plugs still look pretty good even after 92k, amazing!

  9. #9
    Registered Member

    2009 Mazda5 Sport

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    On my '04 Mazda3 w/2.3 engine I replaced them at 110K miles. My fear was they were locked in there as it seemed to take a lot of pressure before one moved. I talked to a Mazda tech and he said he'd never had a plug actually freeze in, so I just used a pipe extension on the socket wrench and they all came out OK.

    I found my plug socket had a tendency to come off the socket wrench and stay on the new plug once installed, so a needle nose plier was necessary to remove the socket from in the plug hole, you can also just tape the socket on to prevent this. I gave each new plug thread a light dab of anti-sieze compound as future insurance. If you have an air source, it's also a good idea to give each plug hole a blast of air to remove any dust or debris before removing the old plugs so nothing falls into the engine when the plug is removed.

    To be honest, I noticed no difference with the new plugs, but it's better to change them than to wait until they possibly stop working correctly, or they do get corroded in.
    Last edited by speedo66; 03-25-2018 at 11:10 AM.

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