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Originally bought the delco, but based upon everyone here I returned them and got the Bosch. I can tell some power is back but wouldn't say it's like new. Solid pull from the engine at all rpm levels. OEM plugs looked okay, but with 92k I felt it time to change.
 

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Discussion Starter #23
I'm a bit past due.....was thinking about taking it in but I'm going for it.
THANKS
Yup! You'll be fine and save yourself maybe $40 in the process :D
 

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Discussion Starter #26

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DO NOT overtorque or cross-thread those plugs! It's an aluminum head and pretty easy to hose the threads. If you do you're screwed and will not like the amount of work required to pull the head and have a timesert or similar put in. IMHO for removal break it free and then use your FINGERS to spin it out so as to avoid the risk of placing lateral loads on the threads as the plug comes out of the hole. You MUST start the new plug by HAND, be gentle, make CERTAIN it is in the hole cleanly, and the threads engaged before anything more than very light finger pressure is used on a bare socket extension. You can and should run it all the way down until the gasket makes contact using nothing more than two fingers on the extension. A torque wrench is IMHO NOT optional for tightening either.
Thanks for suggestions. I am about do DIY spark plug change and wondering what torque value do I need to use? Would it be different if I bough OEM Mazda plugs vs NGK or Bosch plugs?
 

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I found an answer on another thread.
 

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Not every Japanese OEM uses Denso. Honda and Subaru use NGK. Toyota use Denso. I thought my last Mazda used NGK, but I really don’t recall. I haven’t had a Nissan in ages, but when they were Datsun they used NGK.
 

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Hello all, I am approaching the time to change the spark plugs. What is the consensus for the best type of spark plug to use?
 

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Discussion Starter #33
Hello all, I am approaching the time to change the spark plugs. What is the consensus for the best type of spark plug to use?
Boche or Denso, but regardless don't get the cheapest ones you can find because they'll be just that, cheap.
 

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I would like to know where you got the spark plug socket. I cannot find one like it, and I cannot tell the brand. It looks like the word “wrench”, but that seems rather generic, like a bottle that says “beer”.
 

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I would like to know where you got the spark plug socket. I cannot find one like it, and I cannot tell the brand. It looks like the word “wrench”, but that seems rather generic, like a bottle that says “beer”.
I just found my answer. There is a brand named Gearwrench, and the SAE equivalent of 14mm is 9/16. 9/16 is about 1/100th of an inch larger than 14mm. I found what looks like the same wrench on Amazon. GEARWRENCH 3/8" DRIVE 6 POINT 6" MAGNETIC SWIVEL SPARK PLUG SOCKET 9/16" part number 3938D
 

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Yep. Especially with recessed plug wells like on these cars. Why? Because the rubber ones frequently come off ON THE SPARK PLUG when you reinstall the plug and then withdraw the socket. That, when and if it happens, is a serious pain the butt.
 

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If you don't have one, loosen fully the sparkplugs with a typical 13/16" (???) deep socket and remove from the well using a magnet on a rod (or a string). Then to refit the new plugs find a length of hose product that will fit onto the porcelain nose of the spark plug.... start the plug into the head, tighten the plug by hand with the hose 'till it slips off, and then tighten the plug with the deep 13/16" socket and torque wrench.
 

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Sorry... the plugs appear to be the smaller-sized ones. The 13/16" size I mentioned is too big...
 

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I just did a spark plug replacement after about 79k on my '17 6 GT no eloop. I followed the instructions posted here and also on Mazda Mazda6 Engine Spark Plugs Replacement Guide - 2014 To 2018 Model Years - SkyActiv-G DOHC 16V VVT I4 Motor - Picture Illustrated Automotive Maintenance DIY Instructions

the 9/16" magnetic spark plug socket from GearWrench on amazon didn't fit. It was about 1cm short so I ended up getting a larger regular socket at autozone to loosen the spark plugs and then used the GearWrench to just magnetically lift it out of the socket well. Also used it to gently hand tighten the new Bosch 9621 plugs in before tightening with the regular socket. Nice and easy process. Saved some serious $$ doing it myself. I'm not an expert but the old plugs still looked like it had some life left in them but alas, can't hurt to replace with new Bosch plugs!

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