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Spark Plugs Worn Out? #5335722 01/29/20 05:42 PM
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GMFan Offline OP
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2011 Mazda6 4cyl. The manual says to replace every 75k miles. These plugs were installed 4 yrs ago, with 71k miles on the ODO. I changed them out last weekend at 136k miles, so 65k total on plugs. I use the Motorcraft Platinum as that is the OEM. I believe they are the SP411.

No misfires or drive-ability complaints - just figured it was a good time. Is this a good interval, or should I be replacing sooner? These plugs cost around $4/piece, so it isn't very expensive to change them out. I just don't want to change them out needlessly.

Spark Plugs, Old vs. New

Thanks.

edit: While I was changing out the plugs, I took a look down the spark plug hole. The piston tops were black with carbon. Any concerns with this, or is this fairly normal at this age/mileage?

Last edited by GMFan; 01/29/20 05:44 PM.

11 Mazda6, 2.5L/6MT - 136K
Re: Spark Plugs Worn Out? [Re: GMFan] #5335724 01/29/20 05:48 PM
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jayjr1105 Online Content
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Looks like a fair amount of wear on the electrode. You can tell by the rounding shape of it. What engine are we talking? If a skyactiv engine, it should have been NGK or Denso iridiums. My guess is it's the non-DI mazda motor.

Looks like even the 2.5L should be NGK laser iridiums FYI. You maybe went down a grade with the Motorcraft's

Last edited by jayjr1105; 01/29/20 05:55 PM.

2013 Mazda 3 - PP 0w20
2005 Honda Odyssey - PP HM 5w20
Re: Spark Plugs Worn Out? [Re: jayjr1105] #5335725 01/29/20 05:55 PM
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Sorry, I forgot to mention - this is the older 4 cylinder, 2.5L MZR (non-DI, non sky-activ) engine from the Ford-Mazda merger days. This car has lot of FoMoCo parts on it since it was produced in Ford plant as well. My understanding is it's very similar to the 2.5L Ford Duratec, with some slight modifications.

I'm almost certain that the original factory OEM spark plugs I pulled out at 71k miles were Motorcraft.

Thanks for your reply.

edit: I added a picture of the engine. I noticed that not only did the mice living under the engine cover mess up the padding under the cover, but looks like they also made lunch out of the tubing around the #3 ignition wire. smirk2

Last edited by GMFan; 01/29/20 06:05 PM.

11 Mazda6, 2.5L/6MT - 136K
Re: Spark Plugs Worn Out? [Re: GMFan] #5335730 01/29/20 06:02 PM
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slacktide_bitog Offline
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Most Motorcraft spark plugs are Autolite cry

Platinum is usually good for 60k. The OE seems to have been iridium on your 6.

I would suggest Denso or NGK iridium. You might like the Denso Iridium TT

Re: Spark Plugs Worn Out? [Re: GMFan] #5335731 01/29/20 06:03 PM
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SEMI_287 Offline
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Jesus! crzy


2013 Hyundai Elantra- Valvoline Synpower 10w30, Champion
2005 BMW 325xi- M1 0w40, K&N
2007 Chrysler 300C- M1 0w20, Wix




Re: Spark Plugs Worn Out? [Re: GMFan] #5335732 01/29/20 06:04 PM
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If they are OEM then great, but in my opinion, I would run an Iridium plug. You're perfectly fine with the OEM ones for now, but you can't go wrong with a NGK or Denso Iridium. To answer the main question however, I'd say yes, those plugs were ready to be replaced. Run those 30K then replace with Denso TT's which is are the best bang for buck plug.

Last edited by jayjr1105; 01/29/20 06:06 PM.

2013 Mazda 3 - PP 0w20
2005 Honda Odyssey - PP HM 5w20
Re: Spark Plugs Worn Out? [Re: jayjr1105] #5335734 01/29/20 06:12 PM
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GMFan Offline OP
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Originally Posted by jayjr1105
If they are OEM then great, but in my opinion, I would run an Iridium plug. You're perfectly fine with the OEM ones for now, but you can't go wrong with a NGK or Denso Iridium. To answer the main question however, I'd say yes, those plugs were ready to be replaced. Run those 30K then replace with Denso TT's which is are the best bang for buck plug.


Thanks. Although I'm 99% sure the original plugs I pulled out were Motorcraft, I'll say I do not know what exact type they were (platinum or iridium). I may have gotten some wrong information from the internet back when I originally changed them out thinking these were the exact OEM type. The internet is never wrong, right? LOL

Growing up, my father taught me to always use OEM spark plugs to avoid issues. He only used AcDelco in his Chevy trucks. Not sure if that sentiment still holds true with today's engines.

Last edited by GMFan; 01/29/20 06:14 PM.

11 Mazda6, 2.5L/6MT - 136K
Re: Spark Plugs Worn Out? [Re: GMFan] #5335748 01/29/20 06:23 PM
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ejes Offline
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Good photos, thanks for sharing those.

Last edited by ejes; 01/29/20 06:24 PM.
Re: Spark Plugs Worn Out? [Re: GMFan] #5335759 01/29/20 06:34 PM
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Rock Auto could be wrong but they show laser iridiums as the OE part for the 2010 2.5L engine. The gaping is all over the place too so that's odd. .040 is usually for the skyactiv engine. .052 sounds right for the non DI motor.
[Linked Image]

Last edited by jayjr1105; 01/29/20 06:35 PM.

2013 Mazda 3 - PP 0w20
2005 Honda Odyssey - PP HM 5w20
Re: Spark Plugs Worn Out? [Re: slacktide_bitog] #5335763 01/29/20 06:35 PM
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The electrode gaps on the used plugs are huge compared to the new plugs. Surprised the engine wasn’t running rough with those plugs. Yes it was time to change them.

Re: Spark Plugs Worn Out? [Re: GMFan] #5335765 01/29/20 06:37 PM
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Sorry my last post shows I searched Mazda 3 but should be 6. Doesn't matter, same NGK OE plug shows up when you search the 6.


2013 Mazda 3 - PP 0w20
2005 Honda Odyssey - PP HM 5w20
Re: Spark Plugs Worn Out? [Re: jayjr1105] #5335781 01/29/20 06:47 PM
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GMFan Offline OP
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Originally Posted by jayjr1105
Rock Auto could be wrong but they show laser iridiums as the OE part for the 2010 2.5L engine. The gaping is all over the place too so that's odd. .040 is usually for the skyactiv engine. .052 sounds right for the non DI motor.
[Linked Image]


RockAuto says NGK 90083 Iridium are the Actual OEM Part. Maybe they were NGK I pulled out of there originally - they do have that same light blue writing on them which maybe why I confused them.

RockAuto OEM

Next time I'll go with Iridiums thumbsup


11 Mazda6, 2.5L/6MT - 136K
Re: Spark Plugs Worn Out? [Re: GMFan] #5335826 01/29/20 07:21 PM
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Dude. Your fine wire electrodes are missing. Good thing you pulled them. coffee


If you want the job done right......do it yourself.
Re: Spark Plugs Worn Out? [Re: GMFan] #5335847 01/29/20 07:43 PM
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Those used plugs look pretty bad for that mileage. I've got Denso Platinum TT's in my mazda and have been happy with them for the past 7k miles since install. I've been happy with them in everything I've installed them in actually. My go to 'budget' plug.


2016 Ram 1500 5.7 Hemi 30k QSUD 5w-20 and Mopar filter
1988 F-150. 4.9 I6 251k. 10w-40 QSHM Motorcraft FL1A
2007 Mazda 3 2.3 130k 5w-30 syn-blend and Denso filter
Re: Spark Plugs Worn Out? [Re: SEMI_287] #5335854 01/29/20 07:53 PM
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Originally Posted by SEMI_287
Jesus! crzy



LOL


Exactly right....

Them plugs were like a steak on the grill 30 minutes too long...


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