At around 120,000 KM plan for spark plugs. It's easy, especially if you get a 1/4" torque wrench and 14mm 1/4 deep well socket.
Factory plugs were causing the auto transmision to take longer to shift and jerk more suprisingly. I assume because the engine was acting differently than the transmission expected.
You don't need a torque wrench, NGK plugs have a crush washer and specify half turn past initial contact. Did my Mazda 3 with no issues. I have a torque wrench and didn't use it.
NGK Lazer Iridium Plugs is what I got to replace them in my car. I believe those are what Mazda OEM plugs are, but it’s just cheaper to buy the NGKs from a part store.
I bought a 19’ Premium at 17 it’s a great little car beat the shit out of it for 4 years straight and it runs amazing still. Handles well in the winter as long as you have clearance it’ll get you there in one piece. Regular maintenance along with trans fluid change, spark plugs, brakes, diff fluid change. I’d recommend a cpo premium . Great value.
In my 2012 with the 2.5L engine, I replaced my spark plugs with Bosch Iridium (#96302), around 90K miles. It's been great since.
Sparkplugs replaced at 85,000km, with NGK Iridium plugs.
used the laser iridium NGK spark plugs. No issues!!
If it is the skyactive-x be aware that the owners manual advises spark plug replacement at 40k miles and the Mazda plugs are \u00a340 each. I put aftermarket Bosch plugs in and it ran very lumpy and had to replace with Mazda ones.
Please use original plugs for the replacements. Just yanked out aftermarket NGK platinums because of a misfire. For some reason, Mazda and aftermarket plugs in my experience always resulted in a misfire.
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This part for Mazda 3 is made around the world. We have reviews for spark plug manufacturers from countries such as: Japan, Germany .
In March 2026, the ranking of spark plug for Mazda 3 on PartReview included 3 manufacturers. It is based on 13 reviews and 39 votes.
Last month, PartReview users preferred NGK. 53% of positive votes went to this manufacturer.
In second place: spark plug OEM Mazda — 15%.
Third place: Bosch with 0% of the votes.
In the overall ranking of spark plug, which aggregates opinions of owners of different car makes and models, these brands hold the following positions:
After seeing which spark plug owners of Mazda 3 prefer, check other popular parts for this car. In March 2026, leaders on PartReview were:
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