Spark Plugs

josh1581

Member
So for the DIY folks out there. What has been the general consensus on what to use for our Mazda5's? Anyone know who makes the OEM spark plugs? I wouldn't mind going OEM, but don't care to buy from the stealership just to get a Mazda logo on the plugs. I'm looking at the NGK Iridium IX's. Anybody have any feedback on those particular plugs?

Thanks!
 
Don't know without looking it (which you can too), but the spark plug information is usually on a label stuck on the bottom of your hood.
 
I've learned over the years that you get the best results from the part called for in the manual. Minor modifications in the heat, gap, material, etc can affect performance. Rarely are those affects positive. You have to really know what you're doing to tune a car and modify the spark plugs to meet the modifications.
 
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I've learned over the years that you get the best results from the part called for in the manual. Minor modifications in the heat, gap, material, etc can affect performance. Rarely are those affects positive. You have to really know what you're doing to tune a car and modify the spark plugs to meet the modifications.
+1.

Go OEM. I believe it should be NGK plugs as are most Japanese cars. If you plan to keep the car for a whilem pony up for the Iridium. Otherwise, look for a cheaper cooper or platinum alternative. You can find it from one of the approved Mazda retail vendors (very affordable and helpful) or find the part number and Amazon/eBay it (no support).


http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2583605
 
Couple of weeks ago I installed Bosch Platinum +4 spark plugs. I was a little hesitant since everyone here and Mazda3 forum ppl exclusively use NGKs.
After installation ( pretty easy with the right tools ) engine started normally. I didn't notice any irregularities.
Currently tracking fuel economy, since with old ones I averaged 12.5 l/100km 90% city driving.

People on Mazda 3 Forum (can't post a link)
Oem Spark plugs made by NGK
--2004-2005 Mazda3's, model ITR6-F13, part number 4477.
--2006-2009 Mazda3's, model ILTR5A-13G, part number 3811.


Disclaimer: I'm not responsible for anything You do on Your car. :)
 
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I replace the sparkplugs myself. It is a precision job I can't trust any rookie dealer tech to do it.
It is back breaking for old man like myself so I do it slowly but surely.

 
So for the DIY folks out there. What has been the general consensus on what to use for our Mazda5's? Anyone know who makes the OEM spark plugs? I wouldn't mind going OEM, but don't care to buy from the stealership just to get a Mazda logo on the plugs. I'm looking at the NGK Iridium IX's. Anybody have any feedback on those particular plugs?

Thanks!

There are 2 different plugs used in the 2.3L Mazda5's depending on year. The OEM's are NGK Iridium's also, and they are designed to last 100k miles. I swapped mine at 70k, and they still looked good, so I agree that they can make it to 100k miles. (AMAZING!!!) If you check out the NGK information on the web site, you will find that the Iridium's have a tiny iridium "pad" on the ground electrode, and the center electrode is platinum. Care has to be taken when checking the gap, so that the iridium pad is not deformed or disturbed. If you buy them from MAZDA, they will be NGK Iridiums also.

Pic of mine at 70k miles
<a href="http://s196.photobucket.com/albums/aa318/cardura9/?action=view&current=mazda5sp70k.jpg" target="_blank"><img src="http://i196.photobucket.com/albums/aa318/cardura9/mazda5sp70k.jpg" border="0" alt="Mazda5 2.3l Spark Plug @ 70k miles"></a>
 
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I want to change mine in about 5k miles.

Did you find you had do any re gap on the plugs, or just install?
There are 2 different plugs used in the 2.3L Mazda5's depending on year. The OEM's are NGK Iridium's also, and they are designed to last 100k miles. I swapped mine at 70k, and they still looked good, so I agree that they can make it to 100k miles. (AMAZING!!!) If you check out the NGK information on the web site, you will find that the Iridium's have a tiny iridium "pad" on the ground electrode, and the center electrode is platinum. Care has to be taken when checking the gap, so that the iridium pad is not deformed or disturbed. If you buy them from MAZDA, they will be NGK Iridiums also.

Pic of mine at 70k miles
<a href="http://s196.photobucket.com/albums/aa318/cardura9/?action=view&current=mazda5sp70k.jpg" target="_blank"><img src="http://i196.photobucket.com/albums/aa318/cardura9/mazda5sp70k.jpg" border="0" alt="Mazda5 2.3l Spark Plug @ 70k miles"></a>
 
I replace the sparkplugs myself. It is a precision job I can't trust any rookie dealer tech to do it.
It is back breaking for old man like myself so I do it slowly but surely.




How long did it take for you to do at home? I am debating on trying it myself

Dealer wants $48 for plugs. $75 to replace it.
 
How long did it take for you to do at home? I am debating on trying it myself

Dealer wants $48 for plugs. $75 to replace it.

Well that sounds like 0.5 hr labor, so $75 is not outrageous.

If you have changed spark plugs before on other cars, and you have the tools, it is not difficult.

But if this is your first time ever, and you do not have any tools, it may be best to just let the dealer do it.

If you are going to do yourself, the plugs can be purchased a little cheaper. ~$9 each for the set of identical original equipment NGK iridium plugs. "LTR5BI-13" (90083)
 
Well that sounds like 0.5 hr labor, so $75 is not outrageous.

If you have changed spark plugs before on other cars, and you have the tools, it is not difficult.

But if this is your first time ever, and you do not have any tools, it may be best to just let the dealer do it.

If you are going to do yourself, the plugs can be purchased a little cheaper. ~$9 each for the set of identical original equipment NGK iridium plugs. "LTR5BI-13" (90083)
Thank you

I have done them on NA Miatas years ago
 
Thank you

I have done them on NA Miatas years ago
The spark plugs come pre gapped from the factory and they're shipped with boxes and caps that protect the electrode from any bumps during shipping so really there is no need to mess around with a gapper on these. And since you have done them on the Miata before this will take basically the same tools except you will need a additional socket to remove those coils from on top of the spark plugs. The only other tip I can add is that using Anti-seize on the plug threads is NOT recommended by either NGK nor Mazda.
 
Couple of weeks ago I installed Bosch Platinum +4 spark plugs. I was a little hesitant since everyone here and Mazda3 forum ppl exclusively use NGKs.
After installation ( pretty easy with the right tools ) engine started normally. I didn't notice any irregularities.
Currently tracking fuel economy, since with old ones I averaged 12.5 l/100km 90% city driving.

People on Mazda 3 Forum (can't post a link)
Oem Spark plugs made by NGK
--2004-2005 Mazda3's, model ITR6-F13, part number 4477.
--2006-2009 Mazda3's, model ILTR5A-13G, part number 3811.


Disclaimer: I'm not responsible for anything You do on Your car. :)

Bosch or NGK are both good choices and regularly used in BMW's as OEM equipment.

However, I've been told that Bosch is better then NGK.
 
If that is the case, then maybe put it off for the 90k service that I had planned in a few months?

Replaced spark plugs on a vehicle with Hyundai Theta 2.4L I4 engine recently. Came stock with Denso Iridiums. Supposed to last 100k miles. Looked really good at 98K miles / 8 years when I changed them. Just normal used spark plugs. Had no peformance issues. Probably could have left them alone for another 50K miles. I see no improvement with fresh NGK Iridium plugs. Wouldn't be surprised if it would be same deal on Mz5's 2.5L engine. So I think you can leave it in there for a couple more years and then replace with NGK/Bosch/Denso iridium spark plugs. (NGK is what I usually go with.)
 
I bought some OEM ones from a nearby dealership for a total of $50 and installed them myself at 80k miles. Easy job. Took under ten minutes.
 
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