Replace spark plugs every 75000 miles or 60 months - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 14 (permalink) Old 06-19-2018, 06:58 PM Thread Starter
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Replace spark plugs every 75000 miles or 60 months

I'm assuming this is whatever comes first. Since I only have 31k miles, I have to go by months. My car is 2014, but it was actually made in 2013.

2013 + 60 months = 2018

Even if I go with 2014, it would mean next year.

Does this mean my car is due for spark plug replacement?
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post #2 of 14 (permalink) Old 06-19-2018, 07:13 PM
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Use the original delivery date as your start date. Then follow the manual.
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post #3 of 14 (permalink) Old 06-20-2018, 06:46 AM
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Unless your are having a misfire or you're MPG is starting to reduce at this point your OEM plugs should be fine. Modern engines & plugs can easily hit 75-100K on Factory plugs pending on driving habits of course.

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post #4 of 14 (permalink) Old 06-20-2018, 07:20 AM
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On that note for those who has changed out your plugs what did you end of replacing them with?
If it was different than the OEM plugs did you feel any difference between them? Does the manual state the GAP size?

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post #5 of 14 (permalink) Old 06-20-2018, 07:50 AM Thread Starter
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My mpg is 19.5 but then again I don't drive much
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post #6 of 14 (permalink) Old 06-20-2018, 08:37 AM
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Quote:
On that note for those who has changed out your plugs what did you end of replacing them with?
Denso IXEH20TT.

Modern plugs cannot be gapped as can older conventional ones; doing so risks destroying the plug. Don't, in other words.
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post #7 of 14 (permalink) Old 06-20-2018, 10:23 AM Thread Starter
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Originally Posted by tickerguy View Post
Denso IXEH20TT.

Modern plugs cannot be gapped as can older conventional ones; doing so risks destroying the plug. Don't, in other words.
Answer my question kind sir

Do I need replacement?
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post #8 of 14 (permalink) Old 06-20-2018, 10:40 AM
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Quote:
Originally Posted by Mazda6Suspension View Post
Answer my question kind sir

Do I need replacement?
He did; go get Denso plugs.

As for needing replacement, everyone else answered you - if you're not seeing any difference in performance, don't bother. If you're still not satisfied, pull one out and see how it looks.

I know you think non-video DIYs are worthless, but here you go anyways: http://forum.mazda6club.com/engine-s...eplacment.html

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post #9 of 14 (permalink) Old 06-20-2018, 10:45 AM
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"Need"? Probably not. I change on 50k mile intervals and visually they look fine when removed. But they're inexpensive and I have noted a small, but notable different in lower-RPM, high-load operational smoothness after changing them, so I will continue to do so. In addition since this is a steel-into-aluminum interface (the head) leaving them in the engine for an extraordinary length of time runs a risk of galvanic corrosion that I find unacceptable, since a damaged head (e.g. the plug hole threads, if it happens) means lots of money to fix.

Mazda's "branded" plugs are ridiculously expensive, incidentally, should you choose to use them. Note that a fairly serious degree of caution and a torque wrench are absolutely required to do this job; if you cross-thread or strip the head you're in a world of hurt.

I haven't had trouble with the NGKs -- Bosch also makes good stuff.

Last edited by tickerguy; 06-20-2018 at 10:48 AM.
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post #10 of 14 (permalink) Old 06-20-2018, 11:20 AM Thread Starter
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Doesn't Mazda use NKG? And yes I've already seen shiro shinobi thread on spark plugs

The NKG are like $12 each on amazon I think, maybe cheaper on other sites

I would just take my car to my mechanic and have them replace them. You say every 50k but my situation is that I don't go by miles, but months. I don't drive enough. I only have 31k miles. I only put 6500 miles since I bought the car on November 2016 with 24.5k miles
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