I just went to Mazda and spent $200.00 for my new spark plugs
I went and test drove it and it does appear more responsive & peppier 
ZOOMZOOM RULES
I would suggest to contact NGK USA asking them to verify if your plug set from Parts Avatar is legit. This’d help members to make decision whether they should get aftermarket NGK plugs which are much cheaper than OEM NGK plugs. If you aren’t willing to pay double for OEM plugs, make sure to get NGK plugs from authorized NGK resellers (I believe Advanced Auto Parts is a one). One member used the price-matching to Rock-Auto and get a NGK set from Advanced Auto with good savings and greater peace of mind.I just went to Mazda and spent $200.00 for my new spark plugs
I hope that this helps people that need new spark plugs, strictly buy OEM from MAZDA & it says on the box, Made in Japan
Here in Canada is a little bit different. NGK Canada is the distributor and they might be importing these plugs from another source. Spark plugs made in Thailand can be perfectly legit but they are not made in Japan anymore - could be quality control issue and certain percentage of them might be slightly out of specs, enough to cause different issues. Usually you need to buy 4 of them - now find the one causing the problem? I am planning to check with local Mazda dealer and if they still sell "Made in Japan" version then I probably overpay and buy from them. Maybe now it is a part of the deal for Mazda - exclusively they still get the Japanese version for much higher price. You want the cheap one, well take a risk and try the one from Thailand. Just my guess
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Mazda does sell OEM “Value Line” spark plugs which are about the same price as the aftermarket NGK plugs. Not sure who made them but they’re made in Mexico with “Mazda” imprint on the ceramic insulator. If I want go cheap, these Mazda OEM “Value Line” spark plugs can be my alternative.Here in Canada is a little bit different. NGK Canada is the distributor and they might be importing these plugs from another source. Spark plugs made in Thailand can be perfectly legit but they are not made in Japan anymore - could be quality control issue and certain percentage of them might be slightly out of specs, enough to cause different issues. Usually you need to buy 4 of them - now find the one causing the problem? I am planning to check with local Mazda dealer and if they still sell "Made in Japan" version then I probably overpay and buy from them. Maybe now it is a part of the deal for Mazda - exclusively they still get the Japanese version for much higher price. You want the cheap one, well take a risk and try the one from Thailand. Just my guess
The NGK that were made in Thialand the new ones from Mazda are made in JapanHere in Canada is a little bit different. NGK Canada is the distributor and they might be importing these plugs from another source. Spark plugs made in Thailand can be perfectly legit but they are not made in Japan anymore - could be quality control issue and certain percentage of them might be slightly out of specs, enough to cause different issues. Usually you need to buy 4 of them - now find the one causing the problem? I am planning to check with local Mazda dealer and if they still sell "Made in Japan" version then I probably overpay and buy from them. Maybe now it is a part of the deal for Mazda - exclusively they still get the Japanese version for much higher price. You want the cheap one, well take a risk and try the one from Thailand. Just my guess
There is absolutely nothing wrong with RockAuto. They are 100% absolutely legit.
True. Quirkparts has an eBay store, and they are an actual dealership out of Mass. I buy from them all the time.
The NGK that I had put in last summer were made in Thailand, and the new spark plugs from Mazda today are made in Japan. On my drive to work tonight I noticed my CX-5 is smoother
After what I just experienced, I’m strictly buying OEM Dealer spark plugs. Piece of mind.
